| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acidosis | (noun) abnormally high acidity (excess hydrogen-ion concentration) of the blood and other body tissues | - |
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| acidotic | (adjective) having or being characterized by acidosis | - |
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| acidulate | (verb) make sour or more sour | Synonyms: acetify, acidify, sour |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulous | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulent |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acinar | (adjective) pertaining to the individual parts making up an aggregate fruit like a blackberry | - |
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| (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinic, acinose, acinous |
| acinic | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinose, acinous |
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| acinose | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinous |
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| acinous | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinose |
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| acinus | (noun) one of the small sacs or saclike dilations in a compound gland | - |
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| (noun) one of the small drupes making up an aggregate or multiple fruit like a blackberry | - |
| acmeism | (noun) An early 20th-century Russian school of poetry that rejected the vagueness and emotionality of Symbolism in favor of Imagist clarity and texture. | - |
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| acneiform | (adjective) resembling acne | - |
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| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| (noun) a remedy for hearing loss or deafness | - |
| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acoustically | (adverb) with respect to acoustics | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| acquaint | (verb) cause to come to know personally | Synonyms: introduce, present |
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| (verb) make familiar or conversant with | Synonyms: familiarise, familiarize |
| (verb) inform | - |
| acquaintance | (noun) personal knowledge or information about someone or something | Synonyms: conversance, conversancy, familiarity |
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| (noun) a person with whom you are acquainted | Synonyms: friend |
| (noun) a relationship less intimate than friendship | Synonyms: acquaintanceship |
| acquaintanceship | (noun) a relationship less intimate than friendship | Synonyms: acquaintance |
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| acquainted | (adjective) having fair knowledge of | - |
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| acquiesce | (verb) to agree or express agreement | Synonyms: accede, assent |
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| acquiescence | (noun) agreement with a statement or proposal to do something | Synonyms: assent |
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| (noun) acceptance without protest | - |
| acquiescent | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: biddable |
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| acquirable | (adjective) capable of being acquired | - |
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| acquire | (verb) come to have or undergo a change of (physical features and attributes) | Synonyms: develop, get, grow, produce |
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| (verb) take on a certain form, attribute, or aspect | Synonyms: adopt, assume, take, take on |
| (verb) gain through experience | Synonyms: develop, evolve |
| (verb) gain knowledge or skills | Synonyms: larn, learn |
| (verb) come into the possession of something concrete or abstract | Synonyms: get |
| (verb) win something through one's efforts | Synonyms: gain, win |
| (verb) locate (a moving entity) by means of a tracking system such as radar | - |
| acquired | (adjective) gotten through environmental forces | - |
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| acquirement | (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquisition, attainment, skill |
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| acquirer | (noun) a corporation gaining financial control over another corporation or financial institution through a payment in cash or an exchange of stock | - |
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| (noun) the financial institution that dispenses cash in automated teller machines and collects a fee from the bank that issued the credit card | - |
| (noun) a credit card processing bank; merchants receive credit for credit card receipts less a processing fee | Synonyms: merchant bank |
| (noun) a person who acquires something (usually permanently) | - |
| acquiring | (noun) the act of acquiring something | Synonyms: getting |
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| acquisition | (noun) the act of contracting or assuming or acquiring possession of something | - |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, attainment, skill |
| (noun) the cognitive process of acquiring skill or knowledge | Synonyms: learning |
| (noun) something acquired | - |
| acquisitive | (adjective) eager to acquire and possess things especially material possessions or ideas | - |
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| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| acquit | (verb) behave in a certain manner; show a certain behavior; conduct or comport oneself | Synonyms: act, bear, behave, carry, comport, conduct, deport, do |
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| (verb) pronounce not guilty of criminal charges | Synonyms: assoil, clear, discharge, exculpate, exonerate |
| acquittal | (noun) a judgment of not guilty | - |
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| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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| acquitted | (adjective) declared not guilty of a specific offense or crime; legally blameless | Synonyms: not guilty |
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| acrid | (adjective) strong and sharp | Synonyms: pungent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| acridness | (noun) extreme bitterness | Synonyms: acridity |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridity |
| acrimonious | (adjective) marked by strong resentment or cynicism | Synonyms: bitter |
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| acrimony | (noun) a rough and bitter manner | Synonyms: acerbity, bitterness, jaundice, tartness, thorniness |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrocentric | (adjective) having a subterminal centromere | - |
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| acrocyanosis | (noun) cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion | Synonyms: Raynaud's sign |
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| acrogenic | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenous |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromegalic | (adjective) marked or affected by enlargement or hypertrophy of the extremities or the face | - |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acromion | (noun) the outermost point of the spine of the shoulder blade | Synonyms: acromial process |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| acropolis | (noun) the citadel in ancient Greek towns | - |
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| acroscopic | (adjective) facing or on the side toward the apex | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| acrylamide | (noun) a white crystalline amide of propenoic acid can damage the nervous system and is carcinogenic in laboratory animals | - |
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| acrylic | (noun) a synthetic fabric made from polyacrylonitrile | - |
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| (noun) used especially by artists | Synonyms: acrylic paint |
| (noun) a glassy thermoplastic; can be cast and molded or used in coatings and adhesives | Synonyms: acrylate resin, acrylic resin |
| (noun) polymerized from acrylonitrile | Synonyms: acrylic fiber |
| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| actinoid | (adjective) having a radial form | - |
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| (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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