| accustomed | (adjective) commonly used or practiced; usual | Synonyms: customary, habitual, wonted |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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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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| 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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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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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) | - |
| achievement | (noun) the action of accomplishing something | Synonyms: accomplishment |
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| achimenes | (noun) any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias | Synonyms: hot water plant |
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| achlamydeous | (adjective) not having a floral envelope or perianth | - |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromatise | (verb) remove color from | Synonyms: achromatize |
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| achromatism | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, colorlessness, colourlessness |
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| achromatize | (verb) remove color from | Synonyms: achromatise |
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| achromatous | (adjective) having little or inadequate color | - |
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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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| achromic | (adjective) having no color | Synonyms: achromous |
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| achromous | (adjective) having no color | Synonyms: achromic |
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| acidemia | (noun) a blood disorder characterized by an increased concentration of hydrogen ions in the blood (which falls below 7 on the pH scale) | - |
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| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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| acknowledgement | (noun) a statement acknowledging something or someone | Synonyms: acknowledgment |
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| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgment, recognition |
| acknowledgment | (noun) a statement acknowledging something or someone | Synonyms: acknowledgement |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: citation, cite, credit, mention, quotation, reference |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, recognition |
| acme | (noun) the highest point (of something) | Synonyms: apex, peak, vertex |
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| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: elevation, height, meridian, peak, pinnacle, summit, superlative, tiptop, top |
| 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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| acousma | (noun) illusory auditory perception of strange nonverbal sounds | Synonyms: auditory hallucination |
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| acquirement | (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquisition, attainment, skill |
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| 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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| 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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| 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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| 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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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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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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| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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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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| 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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| 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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| 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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| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
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| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| acumen | (noun) shrewdness shown by keen insight | Synonyms: insightfulness |
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| (noun) a tapering point | - |
| acuminate | (adjective) (of a leaf shape) narrowing to a slender point | - |
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| (verb) make sharp or acute; taper; make (something) come to a point | - |
| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adamance | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: obduracy, unyieldingness |
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| adamant | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamantine, inexorable, intransigent |
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| (noun) very hard native crystalline carbon valued as a gem | Synonyms: diamond |
| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adamantly | (adverb) inflexibly; unshakably | - |
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| addendum | (noun) textual matter that is added onto a publication; usually at the end | Synonyms: postscript, supplement |
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| adenocarcinoma | (noun) malignant tumor originating in glandular epithelium | Synonyms: glandular cancer, glandular carcinoma |
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| adenocarcinomatous | (adjective) of or pertaining to adenocarcinoma | - |
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| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adenoma | (noun) a benign epithelial tumor of glandular origin | - |
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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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| adermin | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: pyridoxal, pyridoxamine, pyridoxine, vitamin B6 |
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| adjournment | (noun) the termination of a meeting | Synonyms: dissolution |
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| (noun) the act of postponing to another time or place | - |
| adjustment | (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: alteration, modification |
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| (noun) the act of adjusting something to match a standard | Synonyms: readjustment, registration |
| (noun) making or becoming suitable; adjusting to circumstances | Synonyms: accommodation, fitting |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: allowance |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaptation, adaption |
| adman | (noun) someone whose business is advertising | Synonyms: advertiser, advertizer |
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| admass | (noun) the segment of the public that is easily influenced by mass media (chiefly British) | - |
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| admeasure | (verb) determine the quantity of someone's share | - |
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| administer | (verb) give or apply (medications) | Synonyms: dispense |
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| (verb) administer or bestow, as in small portions | Synonyms: allot, deal, deal out, dish out, dispense, distribute, dole out, lot, mete out, parcel out, shell out |
| (verb) perform (a church sacrament) ritually | - |
| (verb) work in an administrative capacity; supervise or be in charge of | Synonyms: administrate |
| (verb) direct the taking of | - |
| administrable | (adjective) capable of being administered or managed | - |
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| administrate | (verb) work in an administrative capacity; supervise or be in charge of | Synonyms: administer |
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| administration | (noun) a method of tending to or managing the affairs of some group of people (especially the group's business affairs) | Synonyms: disposal |
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| (noun) the act of administering medication | Synonyms: giving medication |
| (noun) the act of meting out justice according to the law | Synonyms: judicature |
| (noun) the act of governing; exercising authority | Synonyms: governance, governing, government, government activity |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: brass, establishment, governance, governing body, organisation, organization |
| (noun) the tenure of a president | Synonyms: presidency, presidential term |
| administrative | (adjective) of or relating to or responsible for administration | - |
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| administratively | (adverb) by or for an administrator | - |
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| administrator | (noun) someone who administers a business | Synonyms: decision maker |
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| (noun) the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor | - |
| (noun) someone who manages a government agency or department | Synonyms: executive |
| administrivia | (noun) the tiresome but essential details that must be taken care of and tasks that must be performed in running an organization | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admirable | (adjective) inspiring admiration or approval | - |
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| (adjective) deserving of esteem and respect | Synonyms: estimable, good, honorable, respectable |
| admirableness | (noun) admirable excellence | Synonyms: admirability, wonderfulness |
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| admirably | (adverb) in an admirable manner | Synonyms: commendable, laudably, praiseworthily |
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| admiral | (noun) any of several brightly colored butterflies | - |
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| (noun) the supreme commander of a fleet; ranks above a vice admiral and below a fleet admiral | Synonyms: full admiral |
| admiralty | (noun) the office of admiral | - |
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| (noun) the department in charge of the navy (as in Great Britain) | - |