| 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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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| aboriginal | (adjective) characteristic of or relating to people inhabiting a region from the beginning | Synonyms: native |
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| (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: primaeval, primal, primeval, primordial |
| (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abridge | (verb) reduce in scope while retaining essential elements | Synonyms: abbreviate, contract, cut, foreshorten, reduce, shorten |
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| (verb) lessen, diminish, or curtail | - |
| abridged | (adjective) (used of texts) shortened by condensing or rewriting | - |
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| abridgement | (noun) a shortened version of a written work | Synonyms: abridgment, capsule, condensation |
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| abridger | (noun) one who shortens or abridges or condenses a written work | Synonyms: abbreviator |
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| abridgment | (noun) a shortened version of a written work | Synonyms: abridgement, capsule, condensation |
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| acariasis | (noun) infestation with itch mites | Synonyms: acaridiasis, acariosis |
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| acaricide | (noun) a chemical agent used to kill mites | Synonyms: acaracide |
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| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| acarine | (noun) mite or tick | - |
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| acariosis | (noun) infestation with itch mites | Synonyms: acariasis, acaridiasis |
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| accessorial | (adjective) nonessential but helpful | - |
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| accipitrine | (adjective) of or relating to or belonging to the genus Accipiter (or to typical hawks) | - |
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| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| acentric | (adjective) lacking a centromere | - |
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| (adjective) not centered or having no center | - |
| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| achlorhydria | (noun) an abnormal deficiency or absence of free hydrochloric acid in the gastric juice; often associated with severe anemias and cancer of the stomach | - |
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| achlorhydric | (adjective) lacking hydrochloric acid | - |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondritic | (adjective) not having a granular structure | - |
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| (adjective) of or related to an achondrite | - |
| acidimetric | (adjective) involving or related to acidimetry | - |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acquiring | (noun) the act of acquiring something | Synonyms: getting |
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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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| acrocentric | (adjective) having a subterminal centromere | - |
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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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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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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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| actuarial | (adjective) of or relating to the work of an actuary | - |
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| 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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| admiringly | (adverb) with admiration | - |
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| adoring | (adjective) extravagantly or foolishly loving and indulgent | Synonyms: doting, fond |
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| (adjective) showing adoration | Synonyms: worshipful |
| adoringly | (adverb) with adoration | - |
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| adrift | (adjective) afloat on the surface of a body of water | - |
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| (adjective) aimlessly drifting | Synonyms: afloat, aimless, directionless, planless, rudderless, undirected |
| (adverb) off course, wandering aimlessly | - |
| (adverb) floating freely; not anchored | - |
| adscript | (adjective) written or printed immediately following another character and aligned with it | - |
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| (adjective) (used of persons) bound to a tract of land; hence their service is transferable from owner to owner | Synonyms: adscripted |
| adscripted | (adjective) (used of persons) bound to a tract of land; hence their service is transferable from owner to owner | Synonyms: adscript |
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| adulterine | (adjective) conceived in adultery | - |
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| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| adventuristic | (adjective) of or pertaining to adventurism | - |
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| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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| aerial | (adjective) existing or living or growing or operating in the air | - |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aeriform, aery, airy, ethereal |
| (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerially | (adverb) by means of aircraft | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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| aeriform | (adjective) resembling air or having the form of air | Synonyms: airlike |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aery, airy, ethereal |
| aerify | (verb) turn into gas | Synonyms: gasify, vaporise, vaporize |
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| afebrile | (adjective) having no fever | - |
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| affricate | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate consonant, affricative |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affricative | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate, affricate consonant |
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| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| (verb) cause fear in | Synonyms: fright, frighten, scare |
| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| aggrieve | (verb) cause to feel sorrow | Synonyms: grieve |
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| (verb) infringe on the rights of | - |
| agrarian | (adjective) relating to farming or agriculture | Synonyms: agricultural, farming |
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| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| agricultural | (adjective) relating to or used in or promoting agriculture or farming | - |
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| (adjective) relating to farming or agriculture | Synonyms: agrarian, farming |
| agriculturalist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturist, cultivator, grower, raiser |
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| agriculture | (noun) the practice of cultivating the land or raising stock | Synonyms: farming, husbandry |
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| (noun) a large-scale farming enterprise | Synonyms: agribusiness, factory farm |
| (noun) the class of people engaged in growing food | - |
| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| ahistorical | (adjective) unconcerned with or unrelated to history or to historical development or to tradition | - |
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| airily | (adverb) in a flippant manner | Synonyms: flippantly |
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| airiness | (noun) the property of something weightless and insubstantial | Synonyms: buoyancy |
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| (noun) the property of something spacious and abounding in fresh air | - |
| (noun) lightness in movement or manner | Synonyms: delicacy |
| airing | (noun) the act of supplying fresh air and getting rid of foul air | Synonyms: ventilation |
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| (noun) a short excursion (a walk or ride) in the open air | - |
| (noun) the opening of a subject to widespread discussion and debate | Synonyms: dissemination, public exposure, spreading |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alacritous | (adjective) quick and eager | - |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| albuminuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: proteinuria |
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| albuminuric | (adjective) of or related to the state of albuminuria | - |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| alfilaria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfileria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algometric | (adjective) of or related to algometry | Synonyms: algometrical |
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| algometrical | (adjective) of or related to algometry | Synonyms: algometric |
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| algorism | (noun) computation with Arabic figures | - |
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| (noun) the Arabic (or decimal) system of numeration | - |
| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| algorithmic | (adjective) of or relating to or having the characteristics of an algorithm | - |
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