| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abaxial | (adjective) facing away from the axis of an organ or organism | Synonyms: dorsal |
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| abbatial | (adjective) of or having to do with or belonging to an abbey or abbot, or abbess | - |
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| abdominal | (adjective) of or relating to or near the abdomen | - |
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| (noun) the muscles of the abdomen | Synonyms: ab, abdominal muscle |
| abdominovesical | (adjective) of or relating to the abdomen and the urinary bladder | - |
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| abettal | (noun) the verbal act of urging on | Synonyms: abetment, instigation |
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| abnormal | (adjective) not normal; not typical or usual or regular or conforming to a norm | Synonyms: unnatural |
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| (adjective) departing from the normal in e.g. intelligence and development | - |
| (adjective) much greater than the normal | - |
| abomasal | (adjective) relating to the abomasum (the fourth compartment of the stomach of ruminants) | - |
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| aboral | (adjective) opposite to or away from the mouth | - |
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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 |
| abranchial | (adjective) having no gills | Synonyms: abranchiate, abranchious, gill-less |
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| abseil | (noun) (mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body | Synonyms: rappel |
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| (verb) descend by means of a rappel | Synonyms: rappel, rope down |
| abysmal | (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abyssal, unfathomable |
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| (adjective) very great; limitless | - |
| abyssal | (adjective) relating to ocean depths from 2000 to 5000 meters | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, unfathomable |
| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| acaudal | (adjective) lacking a tail or taillike appendage | Synonyms: acaudate |
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| accentual | (adjective) (of verse) having a metric system based on stress rather than syllables or quantity | - |
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| (adjective) of or pertaining to accent or stress | - |
| accessional | (adjective) of or constituting an accession | - |
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| accessorial | (adjective) nonessential but helpful | - |
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| accidental | (adjective) not of prime or central importance | Synonyms: incidental, nonessential |
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| (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: inadvertent |
| (noun) a musical notation that makes a note sharp or flat or natural although that is not part of the key signature | - |
| accommodational | (adjective) of or relating to the accommodation of the lens of the eye | - |
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| accrual | (noun) the act of accumulating | Synonyms: accruement, accumulation |
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| acculturational | (adjective) of or relating to acculturation | Synonyms: acculturative |
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| accusal | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusation |
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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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| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acetal | (noun) any organic compound formed by adding alcohol molecules to aldehyde molecules | - |
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| acetaldol | (noun) unsaturated aldol | - |
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| acetyl | (noun) the organic group of acetic acid (CH3CO-) | Synonyms: acetyl group, acetyl radical, ethanoyl group, ethanoyl radical |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acquittal | (noun) a judgment of not guilty | - |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acropetal | (adjective) of leaves or flowers; developing or opening in succession from base to apex | - |
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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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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actual | (adjective) presently existing in fact and not merely potential or possible | Synonyms: existent |
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| (adjective) being or existing at the present moment | - |
| (adjective) taking place in reality; not pretended or imitated | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: genuine, literal, real |
| (adjective) existing in act or fact | Synonyms: factual |
| actuarial | (adjective) of or relating to the work of an actuary | - |
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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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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adaptational | (adjective) of or relating to adaptation | - |
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| adaxial | (adjective) nearest to or facing toward the axis of an organ or organism | Synonyms: ventral |
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| additional | (adjective) further or added | Synonyms: extra |
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| adenoidal | (adjective) of or pertaining to the adenoids | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: nasal, pinched |
| adjectival | (adjective) of or relating to or functioning as an adjective | Synonyms: adjective |
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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 |
| adnexal | (adjective) of or pertaining to adnexa | Synonyms: annexal |
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| adrenal | (adjective) of or pertaining to the adrenal glands or their secretions | - |
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| (adjective) near the kidneys | - |
| (noun) either of a pair of complex endocrine glands situated near the kidney | Synonyms: adrenal gland, suprarenal gland |
| adrenocortical | (adjective) of or derived from the cortex of the adrenal glands | - |
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| adventitial | (adjective) of or pertaining to the adventitia | - |
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| adverbial | (adjective) of or relating to or functioning as an adverb | - |
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| (noun) a word or group of words function as an adverb | - |
| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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| aecial | (adjective) of or belonging to an aecium | - |
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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 |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerological | (adjective) of or pertaining to aerology | - |
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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aesthetical | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetic, esthetic, esthetical |
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| aestival | (adjective) (rare) of or occurring in summer | Synonyms: estival |
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| aetiological | (adjective) relating to the etiology of a disease | Synonyms: aetiologic, etiologic, etiological |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiologic, etiologic, etiological |
| affectional | (adjective) characterized by emotion | Synonyms: affective, emotive |
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| affinal | (adjective) (anthropology) related by marriage | Synonyms: affine |
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| affixal | (adjective) of or pertaining to a linguistic affix | Synonyms: affixial |
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| affixial | (adjective) of or pertaining to a linguistic affix | Synonyms: affixal |
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| afoul | (adjective) especially of a ship's lines etc | Synonyms: foul, fouled |
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| agal | (noun) a cord (usually of goat's hair) that Arabs (especially Bedouins) wind around their heads to hold down the kaffiyeh | - |
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| agential | (adjective) of or relating to an agent or agency | - |
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| agnail | (noun) a loose narrow strip of skin near the base of a fingernail; tearing it produces a painful sore that is easily infected | Synonyms: hangnail |
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| agnostical | (adjective) uncertain of all claims to knowledge | Synonyms: agnostic |
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| agonadal | (adjective) lacking gonads | - |
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| agonal | (adjective) pertaining to or associated with agony (especially death agonies) | - |
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| agonistical | (adjective) striving to overcome in argument | Synonyms: agonistic, combative |
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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 |
| agrobiological | (adjective) of or pertaining to agrobiology | Synonyms: agrobiologic |
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| agrological | (adjective) of or related to agrology | Synonyms: agrologic |
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| agronomical | (adjective) of or relating to or promoting agronomy | Synonyms: agronomic |
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| ahistorical | (adjective) unconcerned with or unrelated to history or to historical development or to tradition | - |
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| ail | (noun) aromatic bulb used as seasoning | Synonyms: garlic |
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| (verb) be ill or unwell | - |
| (verb) cause bodily suffering to and make sick or indisposed | Synonyms: pain, trouble |
| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| (verb) send or transport by airmail | - |
| albinal | (adjective) of or pertaining to or affected by albinism | Synonyms: albinic, albinistic, albinotic |
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| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| alchemical | (adjective) related to or concerned with alchemy | Synonyms: alchemic |
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| alchemistical | (adjective) of or relating to alchemists | Synonyms: alchemistic |
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| 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 | - |
| aldol | (noun) an oily colorless liquid obtained by the condensation of two molecules of acetaldehyde; contains an alcohol group (-OH) and an aldehyde group (-CHO) | Synonyms: aldehyde-alcohol |
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| algal | (adjective) of or relating to alga | - |
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| algebraical | (adjective) of or relating to algebra | Synonyms: algebraic |
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| algometrical | (adjective) of or related to algometry | Synonyms: algometric |
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| alimental | (adjective) of or providing nourishment | Synonyms: alimentary, nourishing, nutrient, nutritious, nutritive |
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| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| alkyl | (noun) any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons | Synonyms: alkyl group, alkyl radical |
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| all | (adjective) (quantifier) used with either mass or count nouns to indicate the whole number or amount of or every one of a class | - |
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| (adjective) completely given to or absorbed by | - |
| (adverb) to a complete degree or to the full or entire extent; Completely or entirely | Synonyms: altogether, completely, entirely, right, totally, whole, wholly |
| allegorical | (adjective) used in or characteristic of or containing allegory | Synonyms: allegoric |
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| allopurinol | (noun) a drug (trade name Zyloprim) used to treat gout and other conditions in which there is an excessive buildup of uric acid | Synonyms: Zyloprim |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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