| acromegaly | (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: acromegalia |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acronymous | (adjective) characterized by the use of acronyms | Synonyms: acronymic |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| acrylamide | (noun) a white crystalline amide of propenoic acid can damage the nervous system and is carcinogenic in laboratory animals | - |
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| acrylate | (noun) a salt or ester of propenoic acid | Synonyms: propenoate |
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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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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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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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| 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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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| actively | (adverb) in an active manner | - |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| actuality | (noun) the state of actually existing objectively | - |
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| actually | (adverb) used to imply that one would expect the fact to be the opposite of that stated; surprisingly | Synonyms: in reality |
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| (adverb) in actual fact | Synonyms: really |
| (adverb) as a sentence modifier to add slight emphasis; as a modifier to add slight emphasis | - |
| (adverb) at present | - |
| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| acutely | (adverb) having a rapid onset | - |
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| (adverb) in a keen or penetrating way | Synonyms: keenly |
| (adverb) changing suddenly in direction and degree | Synonyms: sharp, sharply |
| (adverb) in a shrewd manner | Synonyms: astutely, sagaciously, sapiently, shrewdly |
| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| acyl | (noun) any group or radical of the form RCO- where R is an organic group | Synonyms: acyl group |
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| acylation | (noun) the process of introducing an acyl group into a compound | - |
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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adactylous | (adjective) without fingers and/or toes | - |
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| adactyly | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactylism |
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| adamantly | (adverb) inflexibly; unshakably | - |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| adaxially | (adverb) in an adaxial manner | - |
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| additionally | (adverb) in addition, by way of addition; furthermore | Synonyms: to boot |
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| adenohypophysis | (noun) the anterior lobe of the pituitary body; primarily glandular in nature | Synonyms: anterior pituitary, anterior pituitary gland |
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| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adenomegaly | (noun) gland enlargement | - |
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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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| adenomyosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: endometriosis |
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| adenopathy | (noun) a glandular disease or enlargement of glandular tissue (especially of the lymph glands) | - |
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| adequacy | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequateness |
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| (noun) the quality of being sufficient for the end in view | Synonyms: sufficiency |
| adequately | (adverb) in an adequate manner or to an adequate degree | - |
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| adhocracy | (noun) an organization with little or no structure | - |
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| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adiposity | (noun) having the property of containing fat | Synonyms: adiposeness, fattiness |
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| adjacency | (noun) the attribute of being so near as to be touching | Synonyms: contiguity, contiguousness |
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| adjectivally | (adverb) as an adjective; in an adjectival manner | - |
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| adjectively | (adverb) as an adjective | - |
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| adjudicatory | (adjective) concerned with adjudicating | Synonyms: adjudicative |
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| adjuratory | (adjective) earnestly or solemnly entreating | - |
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| (adjective) containing a solemn charge or command | - |
| administratively | (adverb) by or for an administrator | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admirably | (adverb) in an admirable manner | Synonyms: commendable, laudably, praiseworthily |
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| admiralty | (noun) the office of admiral | - |
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| (noun) the department in charge of the navy (as in Great Britain) | - |
| admiringly | (adverb) with admiration | - |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| admittedly | (adverb) as acknowledged | Synonyms: avowedly, confessedly, true |
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| admonitory | (adjective) serving to warn | Synonyms: cautionary, exemplary, monitory, warning |
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| (adjective) expressing reproof or reproach especially as a corrective | Synonyms: admonishing, reproachful, reproving |
| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adorably | (adverb) in an adorable manner | Synonyms: endearingly |
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| adoringly | (adverb) with adoration | - |
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| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adroitly | (adverb) with adroitness; in an adroit manner | - |
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| adulatory | (adjective) obsequiously complimentary | Synonyms: flattering |
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| adulterously | (adverb) in an adulterous manner | - |
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| adultery | (noun) extramarital sex that willfully and maliciously interferes with marriage relations | Synonyms: criminal conversation, fornication |
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| advantageously | (adverb) in a manner affording benefit or advantage | Synonyms: well |
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| adverbially | (adverb) as an adverb | - |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| adversely | (adverb) in an adverse manner | - |
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| adversity | (noun) a stroke of ill fortune; a calamitous event | - |
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| (noun) a state of misfortune or affliction | Synonyms: hard knocks, hardship |
| advertency | (noun) the process of being heedful | Synonyms: advertence |
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| advertently | (adverb) in a careful deliberate manner | Synonyms: heedfully, mindfully |
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| advisability | (noun) the quality of being advisable | - |
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| advisedly | (adverb) with intention; in an intentional manner | Synonyms: by choice, by design, deliberately, designedly, intentionally, on purpose, purposely |
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| advisory | (adjective) giving advice | Synonyms: consultative, consultatory, consultive |
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| (noun) an announcement that usually advises or warns the public of some threat | - |
| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| adynamia | (noun) lack of strength or vigor (especially from illness) | - |
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| adynamic | (adjective) characterized by an absence of force or forcefulness | Synonyms: undynamic |
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| (adjective) lacking energy or vitality | Synonyms: asthenic, debilitated, enervated |
| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aerially | (adverb) by means of aircraft | - |
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| aerify | (verb) turn into gas | Synonyms: gasify, vaporise, vaporize |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aery | (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, airy, ethereal |
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| (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aesthetically | (adverb) in a tasteful way | Synonyms: esthetically |
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| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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