| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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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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| 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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| 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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| addlehead | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, birdbrain, loon |
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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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| adenopathy | (noun) a glandular disease or enlargement of glandular tissue (especially of the lymph glands) | - |
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| adhere | (verb) follow through or carry out a plan without deviation | - |
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| (verb) stick to firmly | Synonyms: bind, bond, hold fast, stick, stick to |
| (verb) come or be in close contact with; stick or hold together and resist separation | Synonyms: cleave, cling, cohere, stick |
| (verb) be compatible or in accordance with | - |
| (verb) be loyal to | Synonyms: stand by, stick, stick by |
| (verb) be a devoted follower or supporter | Synonyms: stick |
| adherence | (noun) faithful support for a cause or political party or religion | Synonyms: adhesion, attachment |
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| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adhesion, adhesiveness, bond |
| adherent | (adjective) sticking fast | - |
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| (noun) someone who believes and helps to spread the doctrine of another | Synonyms: disciple |
| adhesion | (noun) faithful support for a cause or political party or religion | Synonyms: adherence, attachment |
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| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adherence, adhesiveness, bond |
| (noun) a fibrous band of scar tissue that binds together normally separate anatomical structures | - |
| (noun) abnormal union of bodily tissues; most common in the abdomen | - |
| adhesive | (adjective) tending to adhere | - |
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| (noun) a substance that unites or bonds surfaces together | Synonyms: adhesive agent, adhesive material |
| adhesiveness | (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adherence, adhesion, bond |
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| adhocracy | (noun) an organization with little or no structure | - |
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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| admonish | (verb) take to task | Synonyms: reproof, reprove |
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| (verb) warn strongly; put on guard | Synonyms: caution, monish |
| (verb) advise or counsel in terms of someone's behavior | Synonyms: discourage, monish, warn |
| admonisher | (noun) someone who gives a warning so that a mistake can be avoided | Synonyms: monitor, reminder |
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| admonishing | (adjective) expressing reproof or reproach especially as a corrective | Synonyms: admonitory, reproachful, reproving |
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| admonishment | (noun) a firm rebuke | Synonyms: admonition, monition |
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| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| adrenocorticotrophic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotropic |
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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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| adulthood | (noun) the state (and responsibilities) of a person who has attained maturity | - |
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| (noun) the period of time in your life after your physical growth has stopped and you are fully developed | Synonyms: maturity |
| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophilic | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilous |
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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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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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| 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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| aesthesia | (noun) mental responsiveness and awareness | Synonyms: esthesia, sensibility |
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| aesthesis | (noun) an unelaborated elementary awareness of stimulation | Synonyms: esthesis, sensation, sense datum, sense experience, sense impression |
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| aesthete | (noun) one who professes great sensitivity to the beauty of art and nature | Synonyms: esthete |
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| aesthetic | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetical, esthetic, esthetical |
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| (adjective) relating to or dealing with the subject of aesthetics | Synonyms: esthetic |
| (adjective) aesthetically pleasing | Synonyms: artistic, esthetic |
| (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
| aesthetical | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetic, esthetic, esthetical |
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| aesthetically | (adverb) in a tasteful way | Synonyms: esthetically |
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| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aesthetics | (noun) (art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art) | Synonyms: esthetics |
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| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
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| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| affranchise | (verb) grant freedom to; as from slavery or servitude | Synonyms: enfranchise |
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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 |
| afghan | (noun) a blanket knitted or crocheted in strips or squares; sometimes used as a shawl | - |
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| (noun) a coat made of sheepskin | Synonyms: sheepskin coat |
| afghani | (noun) the basic unit of money in Afghanistan | - |
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| aforethought | (adjective) with planning and intention | Synonyms: planned, plotted |
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| afresh | (adverb) again but in a new or different way | Synonyms: anew |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| aftermath | (noun) the outcome of an event especially as relative to an individual | Synonyms: consequence |
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| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: backwash, wake |
| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agoraphobic | (adjective) suffering from agoraphobia; abnormally afraid of open or public places | - |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphic | (adjective) relating to or having agraphia | - |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| aguish | (adjective) affected by ague | - |
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| ahead | (adjective) having the leading position or higher score in a contest | Synonyms: in the lead, leading |
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| (adverb) at or in the front | Synonyms: before, in front |
| (adverb) ahead of time; in anticipation | Synonyms: beforehand, in advance |
| (adverb) in a forward direction | Synonyms: forrader, forward, forwards, onward, onwards |
| (adverb) leading or ahead in a competition | Synonyms: in the lead, out front |
| (adverb) to a different or a more advanced time (meaning advanced either toward the present or toward the future) | - |
| (adverb) to a more advanced or advantageous position | - |
| (adverb) toward the future; forward in time | Synonyms: forward |
| ahem | (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: hem |
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| ahimsa | (noun) a Buddhist and Hindu and especially Jainist doctrine holding that all forms of life are sacred and urging the avoidance of violence | - |
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| ahistorical | (adjective) unconcerned with or unrelated to history or to historical development or to tradition | - |
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| ahorse | (adjective) traveling on horseback | Synonyms: ahorseback |
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| (adverb) on the back of a horse | Synonyms: ahorseback, horseback |
| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| (verb) paint with an airbrush | - |
| airfreight | (verb) transport (cargo) by air | Synonyms: air-freight, air-ship |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| airheaded | (adjective) lacking seriousness; given to frivolity | Synonyms: dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| airworthiness | (noun) fitness to fly | - |
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| airworthy | (adjective) (of aircraft) fit to fly | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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| alchemic | (adjective) related to or concerned with alchemy | Synonyms: alchemical |
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| alchemical | (adjective) related to or concerned with alchemy | Synonyms: alchemic |
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| alchemise | (verb) alter (elements) by alchemy | Synonyms: alchemize |
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| alchemist | (noun) one who was versed in the practice of alchemy and who sought an elixir of life and a panacea and an alkahest and the philosopher's stone | - |
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| alchemistic | (adjective) of or relating to alchemists | Synonyms: alchemistical |
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| alchemistical | (adjective) of or relating to alchemists | Synonyms: alchemistic |
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| alchemize | (verb) alter (elements) by alchemy | Synonyms: alchemise |
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| alchemy | (noun) a pseudoscientific forerunner of chemistry in medieval times | - |
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| (noun) the way two individuals relate to each other | Synonyms: chemistry, interpersonal chemistry |
| 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 | (adjective) characteristic of or containing alcohol | - |
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| (adjective) addicted to alcohol | Synonyms: alcohol-dependent |
| (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |