| abcoulomb | (noun) a unit of electrical charge equal to 10 coulombs | - |
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| abrocome | (noun) ratlike rodent with soft fur and large ears of the Andes | Synonyms: chinchilla rat, rat chinchilla |
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| absconder | (noun) a fugitive who runs away and hides to avoid arrest or prosecution | - |
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| abscondment | (noun) the act of running away secretly (as to avoid arrest) | Synonyms: decampment |
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| accolade | (noun) a tangible symbol signifying approval or distinction | Synonyms: award, honor, honour, laurels |
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| accommodation | (noun) the act of providing something (lodging or seat or food) to meet a need | - |
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| (noun) (physiology) the automatic adjustment in focal length of the natural lens of the eye | - |
| (noun) living quarters provided for public convenience | - |
| (noun) in the theories of Jean Piaget: the modification of internal representations in order to accommodate a changing knowledge of reality | - |
| (noun) a settlement of differences | - |
| (noun) making or becoming suitable; adjusting to circumstances | Synonyms: adjustment, fitting |
| accommodator | (noun) someone who performs a service or does a favor | Synonyms: obliger |
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| accompaniment | (noun) the act of accompanying someone or something in order to protect them | Synonyms: escort |
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| (noun) something added to complete or embellish or make perfect | Synonyms: complement |
| (noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts | Synonyms: backup, musical accompaniment, support |
| (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: attendant, co-occurrence, concomitant |
| accompanist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanyist |
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| accompanyist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanist |
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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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| accomplishment | (noun) the action of accomplishing something | Synonyms: achievement |
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| (noun) an ability that has been acquired by training | Synonyms: acquirement, acquisition, attainment, skill |
| accord | (noun) sympathetic compatibility | - |
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| (noun) concurrence of opinion | Synonyms: accordance, conformity |
| (noun) a written agreement between two states or sovereigns | Synonyms: pact, treaty |
| (noun) harmony of people's opinions or actions or characters | Synonyms: agreement |
| accordance | (noun) the act of granting rights | Synonyms: accordance of rights |
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| (noun) concurrence of opinion | Synonyms: accord, conformity |
| accordion | (noun) a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player | Synonyms: squeeze box |
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| accordionist | (noun) a musician who plays the accordion | - |
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| accouchement | (noun) the parturition process in human beings; having a baby; the process of giving birth to a child | Synonyms: childbearing, childbirth, vaginal birth |
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| accoucheur | (noun) a physician specializing in obstetrics | Synonyms: obstetrician |
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| accoucheuse | (noun) a woman skilled in aiding the delivery of babies | Synonyms: midwife |
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| account | (noun) the quality of taking advantage | - |
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| (noun) importance or value | - |
| (noun) a record or narrative description of past events | Synonyms: chronicle, history, story |
| (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: bill, invoice |
| (noun) a short account of the news | Synonyms: news report, report, story, write up |
| (noun) a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc. | Synonyms: explanation |
| (noun) the act of informing by verbal report | Synonyms: report |
| (noun) grounds | Synonyms: score |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account statement, accounting |
| (noun) a formal contractual relationship established to provide for regular banking or brokerage or business services | Synonyms: business relationship |
| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| accountancy | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accounting |
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| accountant | (noun) someone who maintains and audits business accounts | Synonyms: comptroller, controller |
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| accountantship | (noun) the position of accountant | - |
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| accounting | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accountancy |
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| (noun) a system that provides quantitative information about finances | - |
| (noun) a convincing explanation that reveals basic causes | - |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account, account statement |
| (noun) a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts | Synonyms: accounting system, method of accounting |
| accouterment | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accoutrement |
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| accoutrement | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accouterment |
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| acolyte | (noun) someone who assists a priest or minister in a liturgical service; a cleric ordained in the highest of the minor orders in the Roman Catholic Church but not in the Anglican Church or the Eastern Orthodox Churches | - |
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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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| acorea | (noun) absence of the pupil in an eye | - |
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| acorn | (noun) fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base | - |
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| acousma | (noun) illusory auditory perception of strange nonverbal sounds | Synonyms: auditory hallucination |
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| acoustic | (noun) a remedy for hearing loss or deafness | - |
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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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| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
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| adenomyosarcoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: embryoma of the kidney, nephroblastoma, Wilms' tumor, Wilms tumour |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| albacore | (noun) large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters | Synonyms: long-fin tunny, Thunnus alalunga |
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| (noun) relatively small tuna with choice white flesh; major source of canned tuna | - |
| alcohol | (noun) a liquor or brew containing alcohol as the active agent | Synonyms: alcoholic beverage, alcoholic drink, inebriant, intoxicant |
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| (noun) any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation | - |
| alcoholic | (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |
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| alcoholism | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: dipsomania, potomania |
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| (noun) habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms | Synonyms: alcohol addiction, drunkenness, inebriation |
| alcove | (noun) a small recess opening off a larger room | Synonyms: bay |
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| alecost | (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: balsam herb, bible leaf, Chrysanthemum balsamita, costmary, mint geranium, Tanacetum balsamita |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| angiosarcoma | (noun) a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels | - |
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| angioscope | (noun) a modified microscope used to study capillary vessels | - |
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| anthracosis | (noun) lung disease caused by inhaling coal dust | Synonyms: black lung, black lung disease, coal miner's lung |
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| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| antimycotic | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic agent, fungicide |
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| aplacophoran | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: solenogaster |
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| apocope | (noun) abbreviation of a word by omitting the final sound or sounds | - |
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| apricot | (noun) a shade of pink tinged with yellow | Synonyms: peach, salmon pink, yellowish pink |
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| (noun) downy yellow to rosy-colored fruit resembling a small peach | - |
| (noun) Asian tree having clusters of usually white blossoms and edible fruit resembling the peach | Synonyms: apricot tree |
| arccos | (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number | Synonyms: arc cosine, arccosine, inverse cosine |
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| arccosecant | (noun) the angle that has a cosecant equal to a given number | Synonyms: arc cosecant, inverse cosecant |
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| arccosine | (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number | Synonyms: arc cosine, arccos, inverse cosine |
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| arccotangent | (noun) the inverse function of the cotangent; the angle that has a cotangent equal to a given number | Synonyms: arc cotangent, inverse cotangent |
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| archdeacon | (noun) (Anglican Church) an ecclesiastical dignitary usually ranking just below a bishop | - |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| ascoma | (noun) an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle | - |
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| ascomycete | (noun) any fungus of the class Ascomycetes (or subdivision Ascomycota) in which the spores are formed inside an ascus | Synonyms: ascomycetous fungus |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascot | (noun) a cravat with wide square ends; secured with an ornamental pin | - |
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| attosecond | (noun) one quintillionth (10^-18) of a second; one thousandth of a femtosecond | - |
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| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autocorrect | (noun) a system for automatically correcting text | - |
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| bacon | (noun) back and sides of a hog salted and dried or smoked; usually sliced thin and fried | - |
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| bagascosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagassosis |
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| balcony | (noun) a platform projecting from the wall of a building and surrounded by a balustrade or railing or parapet | - |
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| (noun) an upper floor projecting from the rear over the main floor in an auditorium | - |
| ballcock | (noun) floating ball that controls level in a water tank | Synonyms: ball cock |
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| bandicoot | (noun) any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous | - |
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| barbasco | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: Jacquinia keyensis, joewood |
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| barleycorn | (noun) a grain of barley | Synonyms: barley |
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| (noun) a grain of barley | - |
| barracouta | (noun) a large marine food fish common on the coasts of Australia, New Zealand, and southern Africa | Synonyms: snoek |
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| basuco | (noun) low-grade cocaine mixed with coca paste and cannabis | - |
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| beachcomber | (noun) a vagrant living on a beach | - |
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| beacon | (noun) a radio station that broadcasts a directional signal for navigational purposes | Synonyms: radio beacon |
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| (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon light, lighthouse, pharos |
| (noun) a fire (usually on a hill or tower) that can be seen from a distance | Synonyms: beacon fire |
| becomingness | (noun) the quality of being becoming | - |
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| bedcover | (noun) decorative cover for a bed | Synonyms: bed cover, bed covering, bedspread, counterpane, spread |
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| bellicoseness | (noun) a natural disposition to fight | Synonyms: bellicosity |
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| bellicosity | (noun) a natural disposition to fight | Synonyms: bellicoseness |
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| bicorn | (noun) a cocked hat with the brim turned up to form two points | Synonyms: bicorne |
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| bicorne | (noun) a cocked hat with the brim turned up to form two points | Synonyms: bicorn |
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| bioscope | (noun) a kind of early movie projector | - |
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| (noun) a South African movie theater | - |