| abdominocentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: paracentesis |
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| abduce | (verb) advance evidence for | Synonyms: adduce, cite |
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| abducens | (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens nerve, abducent, abducent nerve, nervus abducens, sixth cranial nerve |
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| abducent | (adjective) especially of muscles; drawing away from the midline of the body or from an adjacent part | Synonyms: abducting |
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| (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens, abducens nerve, abducent nerve, nervus abducens, sixth cranial nerve |
| abecedarian | (adjective) alphabetically arranged (as for beginning readers) | - |
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| (noun) a novice learning the rudiments of some subject | - |
| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| aberrance | (noun) a state or condition markedly different from the norm | Synonyms: aberrancy, aberration, deviance |
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| abeyance | (noun) temporary cessation or suspension | Synonyms: suspension |
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| abhorrence | (noun) hate coupled with disgust | Synonyms: abomination, detestation, execration, loathing, odium |
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| abidance | (noun) the act of abiding (enduring without yielding) | - |
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| (noun) the act of dwelling in a place | Synonyms: residence, residency |
| (noun) acting according to certain accepted standards | Synonyms: compliance, conformation, conformity |
| abience | (noun) (psychology) an urge to withdraw or avoid a situation or an object | - |
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| abscess | (noun) symptom consisting of a localized collection of pus surrounded by inflamed tissue | - |
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| abscessed | (adjective) infected and filled with pus | - |
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| absence | (noun) failure to be present | - |
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| (noun) the state of being absent | - |
| (noun) the occurrence of an abrupt, transient loss or impairment of consciousness (which is not subsequently remembered), sometimes with light twitching, fluttering eyelids, etc.; common in petit mal epilepsy | Synonyms: absence seizure |
| (noun) the time interval during which something or somebody is away | - |
| absorbance | (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation | Synonyms: optical density, photographic density, transmission density |
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| absorptance | (noun) a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber | Synonyms: absorption coefficient, coefficient of absorption |
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| abstinence | (noun) act or practice of refraining from indulging an appetite | - |
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| (noun) the trait of abstaining (especially from alcohol) | Synonyms: abstention |
| abundance | (noun) the property of a more than adequate quantity or supply | Synonyms: copiousness, teemingness |
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| (noun) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million | - |
| (noun) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present | - |
| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acaulescent | (adjective) (of plants) having no apparent stem above ground | Synonyms: stemless |
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| accede | (verb) yield to another's wish or opinion | Synonyms: bow, defer, give in, submit |
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| (verb) to agree or express agreement | Synonyms: acquiesce, assent |
| (verb) take on duties or office | Synonyms: enter |
| accelerando | (adjective) (music) gradually increasing in tempo | - |
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| (noun) a gradually increasing tempo of music | - |
| (adverb) with increasing speed | - |
| accelerate | (verb) move faster | Synonyms: quicken, speed, speed up |
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| (verb) cause to move faster | Synonyms: speed, speed up |
| accelerated | (adjective) speeded up, as of an academic course | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerative | (adjective) tending to increase velocity | Synonyms: acceleratory |
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| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| acceleratory | (adjective) tending to increase velocity | Synonyms: accelerative |
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| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accent | (noun) the relative prominence of a syllable or musical note (especially with regard to stress or pitch) | Synonyms: emphasis, stress |
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| (noun) distinctive manner of oral expression | Synonyms: speech pattern |
| (noun) a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation | Synonyms: accent mark |
| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: dialect, idiom |
| (noun) special importance or significance | Synonyms: emphasis |
| (verb) put stress on; utter with an accent | Synonyms: accentuate, stress |
| (verb) to stress, single out as important | Synonyms: accentuate, emphasise, emphasize, punctuate, stress |
| accented | (adjective) bearing a stress or accent | Synonyms: stressed |
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| (adjective) (used of syllables) bearing the principle stress, usually accompanied by a change in pitch | Synonyms: tonic |
| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accentor | (noun) small sparrow-like songbird of mountainous regions of Eurasia | - |
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| accentual | (adjective) (of verse) having a metric system based on stress rather than syllables or quantity | - |
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| (adjective) of or pertaining to accent or stress | - |
| accentuate | (verb) to stress, single out as important | Synonyms: accent, emphasise, emphasize, punctuate, stress |
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| (verb) put stress on; utter with an accent | Synonyms: accent, stress |
| accentuation | (noun) the act of giving special importance or significance to something | Synonyms: accenting, emphasizing |
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| (noun) the use or application of an accent; the relative prominence of syllables in a phrase or utterance | - |
| accept | (verb) consider or hold as true | - |
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| (verb) react favorably to; consider right and proper | - |
| (verb) tolerate or accommodate oneself to | Synonyms: live with, swallow |
| (verb) be sexually responsive to, used of a female domesticated mammal | - |
| (verb) give an affirmative reply to; respond favorably to | Synonyms: consent, go for |
| (verb) receive willingly something given or offered | Synonyms: have, take |
| (verb) take on as one's own the expenses or debts of another person | Synonyms: assume, bear, take over |
| (verb) admit into a group or community | Synonyms: admit, take, take on |
| (verb) receive (a report) officially, as from a committee | - |
| (verb) make use of or accept for some purpose | Synonyms: take |
| (verb) be designed to hold or take | Synonyms: take |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| acceptable | (adjective) worthy of acceptance or satisfactory | - |
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| (adjective) adequate for the purpose | - |
| (adjective) meeting requirements | Synonyms: decent, satisfactory |
| (adjective) judged to be in conformity with approved usage | - |
| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| acceptably | (adverb) in an acceptable (but not outstanding) manner | Synonyms: so-so, tolerably |
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| acceptance | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptation, adoption, espousal |
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| (noun) the act of taking something that is offered | - |
| (noun) a disposition to tolerate or accept people or situations | Synonyms: sufferance, toleration |
| (noun) the mental attitude that something is believable and should be accepted as true | Synonyms: credence |
| (noun) (contract law) words signifying consent to the terms of an offer (thereby creating a contract) | - |
| (noun) a time draft drawn on and accepted by a bank | Synonyms: banker's acceptance |
| (noun) the state of being acceptable and accepted | - |
| acceptant | (adjective) accepting willingly | Synonyms: acceptive |
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| acceptation | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, adoption, espousal |
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| (noun) the accepted meaning of a word | Synonyms: word meaning, word sense |
| (noun) acceptance as true or valid | - |
| accepted | (adjective) generally approved or compelling recognition | Synonyms: recognised, recognized |
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| accepting | (adjective) tolerating without protest | - |
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| acceptive | (adjective) inclined to accept rather than reject | - |
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| (adjective) accepting willingly | Synonyms: acceptant |
| acceptor | (noun) the person (or institution) who accepts a check or draft and becomes responsible for paying the party named in the draft when it matures | - |
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| (noun) (chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated | - |
| access | (noun) the act of approaching or entering | - |
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| (noun) a way of entering or leaving | Synonyms: approach |
| (noun) (computer science) the operation of reading or writing stored information | Synonyms: memory access |
| (noun) the right to enter | Synonyms: accession, admission, admittance, entree |
| (noun) the right to obtain or make use of or take advantage of something (as services or membership) | - |
| (noun) a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.) | Synonyms: access code |
| (verb) reach or gain access to | Synonyms: get at |
| (verb) obtain or retrieve from a storage device; as of information on a computer | - |
| accessary | (adjective) aiding and abetting in a crime | Synonyms: accessory |
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| (noun) someone who helps another person commit a crime | Synonyms: accessory |
| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accessible | (adjective) capable of being reached | - |
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| (adjective) easy to get along with or talk to; friendly | - |
| (adjective) easily obtained | - |
| (adjective) capable of being read with comprehension | Synonyms: approachable |
| accession | (noun) the act of attaining or gaining access to a new office or right or position (especially the throne) | Synonyms: rise to power |
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| (noun) the right to enter | Synonyms: access, admission, admittance, entree |
| (noun) agreeing with or consenting to (often unwillingly) | Synonyms: assenting |
| (noun) something added to what you already have | Synonyms: addition |
| (noun) (civil law) the right to all of that which your property produces whether by growth or improvement | - |
| (noun) a process of increasing by addition (as to a collection or group) | - |
| (verb) make a record of additions to a collection, such as a library | - |
| accessional | (adjective) of or constituting an accession | - |
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| accessorial | (adjective) nonessential but helpful | - |
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| accessory | (adjective) furnishing added support | Synonyms: adjunct, adjuvant, ancillary, appurtenant, auxiliary |
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| (adjective) aiding and abetting in a crime | Synonyms: accessary |
| (noun) a supplementary component that improves capability | Synonyms: add-on, appurtenance, supplement |
| (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accouterment, accoutrement |
| (noun) someone who helps another person commit a crime | Synonyms: accessary |
| accidence | (noun) the part of grammar that deals with the inflections of words | Synonyms: inflectional morphology |
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| accomplice | (noun) a person who joins with another in carrying out some plan (especially an unethical or illegal plan) | Synonyms: confederate |
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| accordance | (noun) the act of granting rights | Synonyms: accordance of rights |
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| (noun) concurrence of opinion | Synonyms: accord, conformity |
| ace | (adjective) of the highest quality | Synonyms: A-one, crack, first-rate, super, tiptop, top-notch, topnotch, tops |
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| (noun) a serve that the receiver is unable to reach | - |
| (noun) one of four playing cards in a deck having a single pip on its face | - |
| (noun) someone who is dazzlingly skilled in any field | Synonyms: adept, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, I, one, single, unity |
| (verb) score an ace against | - |
| (verb) serve an ace against (someone) | - |
| (verb) play (a hole) in one stroke | - |
| (verb) succeed at easily | Synonyms: breeze through, nail, pass with flying colors, sail through, sweep through |
| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acedia | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: laziness, sloth |
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| acellular | (adjective) not made up of or divided into cells | Synonyms: noncellular |
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| acentric | (adjective) lacking a centromere | - |
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| (adjective) not centered or having no center | - |
| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephalous | (adjective) lacking a head or a clearly defined head | - |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acerate | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerose, acicular, needle-shaped |
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| acerb | (adjective) sour or bitter in taste | Synonyms: acerbic, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbate | (verb) make sour or bitter | - |
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| (verb) cause to be bitter or resentful | Synonyms: embitter, envenom |
| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| acerola | (noun) acid red or yellow cherry-like fruit of a tropical American shrub very rich in vitamin C | Synonyms: barbados cherry, surinam cherry, West Indian cherry |
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| (noun) tropical American shrub bearing edible acid red fruit resembling cherries | Synonyms: barbados cherry, Malpighia glabra, Surinam cherry, West Indian cherry |
| acerose | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acicular, needle-shaped |
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| acervate | (adjective) pertaining to a growth of fungi that forms a heaped-up mass | - |
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| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| acetal | (noun) any organic compound formed by adding alcohol molecules to aldehyde molecules | - |
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| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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| acetaldol | (noun) unsaturated aldol | - |
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| acetamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: ethanamide |
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| acetaminophen | (noun) an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets) | Synonyms: Anacin III, Datril, Panadol, Phenaphen, Tempra, Tylenol |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetate | (noun) a fabric made from fibers of cellulose acetate | Synonyms: acetate rayon |
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| (noun) a salt or ester of acetic acid | Synonyms: ethanoate |
| acetic | (adjective) relating to or containing acetic acid | - |
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| acetify | (verb) turn acidic | Synonyms: acidify |
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| (verb) make sour or more sour | Synonyms: acidify, acidulate, sour |
| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| acetone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: dimethyl ketone, propanone |
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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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| acetonic | (adjective) of or relating to acetone | - |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetose | (adjective) tasting or smelling like vinegar | Synonyms: acetous, vinegarish, vinegary |
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| acetous | (adjective) tasting or smelling like vinegar | Synonyms: acetose, vinegarish, vinegary |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acetum | (noun) sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative | Synonyms: vinegar |
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| (noun) a dilute solution of acetic acid that is used as a solvent (e.g. for a drug) | - |
| acetyl | (noun) the organic group of acetic acid (CH3CO-) | Synonyms: acetyl group, acetyl radical, ethanoyl group, ethanoyl radical |
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