| agenesis | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesia |
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| aggressiveness | (noun) the quality of being bold and enterprising | - |
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| (noun) a natural disposition to be hostile | Synonyms: belligerence, pugnacity |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggression |
| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| agranulosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, granulocytopenia |
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| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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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 |
| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airworthiness | (noun) fitness to fly | - |
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| akinesis | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesia |
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| albatross | (noun) large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight | Synonyms: mollymawk |
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| (noun) (figurative) something that hinders or handicaps | Synonyms: millstone |
| alertness | (noun) lively attentiveness | Synonyms: on the qui vive, sharp-sightedness |
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| (noun) the process of paying close and continuous attention | Synonyms: vigilance, wakefulness, watchfulness |
| (noun) a state of readiness to respond | Synonyms: alerting |
| alias | (noun) a name that has been assumed | Synonyms: assumed name, false name |
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| alikeness | (noun) similarity in appearance or character or nature between persons or things | Synonyms: likeness, similitude |
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| aliveness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: animateness, liveness |
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| (noun) the condition of living or the state of being alive | Synonyms: animation, life, living |
| alkalosis | (noun) abnormally high alkalinity (low hydrogen-ion concentration) of the blood and other body tissues | - |
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| allantois | (noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) | - |
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| allegoresis | (noun) the interpretation of written, oral, or artistic expression as allegory. | - |
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| allegoricalness | (noun) The state or quality of being allegorical. | - |
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| allies | (noun) an alliance of nations joining together to fight a common enemy | - |
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| allis | (noun) European shad | Synonyms: allice, allice shad, allis shad, Alosa alosa |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alms | (noun) money or goods contributed to the poor | - |
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| aloes | (noun) a purgative made from the leaves of aloe | Synonyms: bitter aloes |
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| aloneness | (noun) a disposition toward being alone | Synonyms: loneliness, lonesomeness, solitariness |
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| aloofness | (noun) a disposition to be distant and unsympathetic in manner | Synonyms: remoteness, standoffishness, withdrawnness |
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| (noun) indifference by personal withdrawal | Synonyms: distance |
| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| amanuensis | (noun) someone skilled in the transcription of speech (especially dictation) | Synonyms: shorthand typist, stenographer |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| amativeness | (noun) the arousal of feelings of sexual desire | Synonyms: amorousness, eroticism, erotism, sexiness |
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| amaurosis | (noun) partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain | - |
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| ambages | (noun) (archaic) roundabout or mysterious ways of action | - |
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| ambassadress | (noun) a woman ambassador | - |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| amebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amoebiasis, amoebiosis |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| amenableness | (noun) the trait of being cooperative | Synonyms: amenability, cooperativeness |
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| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| amenities | (noun) things that make you comfortable and at ease | Synonyms: comforts, conveniences, creature comforts |
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| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| amitosis | (noun) the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes | - |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| amnios | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnion, amniotic sac |
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| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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| amoebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiasis |
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| amorousness | (noun) a feeling of love or fondness | Synonyms: enamoredness |
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| (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, eroticism, erotism, sexiness |
| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| ampleness | (noun) the property of impressive largeness in size | - |
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| (noun) the property of being more than sufficient; comfortable sufficiency | - |
| amyloidosis | (noun) a disorder characterized by deposit of amyloid in organs or tissues; often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma | - |
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| amylolysis | (noun) conversion of starch to sugar | - |
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| anabiosis | (noun) suspended animation in organisms during periods of extreme drought from which they revive when moisture returns | - |
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| anaclisis | (noun) (psychoanalysis) relationship marked by strong dependence on others; especially a libidinal attachment to e.g. a parental figure | - |
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| anadiplosis | (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: reduplication |
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| anagrams | (noun) a game whose object is to form words from a group of randomly chosen letters | - |
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| analects | (noun) a collection of excerpts from a literary work | Synonyms: analecta |
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| analysis | (noun) an investigation of the component parts of a whole and their relations in making up the whole | - |
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| (noun) a set of techniques for exploring underlying motives and a method of treating various mental disorders; based on the theories of Sigmund Freud | Synonyms: depth psychology, psychoanalysis |
| (noun) the abstract separation of a whole into its constituent parts in order to study the parts and their relations | Synonyms: analytic thinking |
| (noun) a branch of mathematics involving calculus and the theory of limits; sequences and series and integration and differentiation | - |
| (noun) a form of literary criticism in which the structure of a piece of writing is analyzed | - |
| (noun) the use of closed-class words instead of inflections: e.g., `the father of the bride' instead of `the bride's father' | - |
| anamnesis | (noun) the ability to recall past occurrences | Synonyms: recollection, remembrance |
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| (noun) the case history of a medical patient as recalled by the patient | Synonyms: medical history, medical record |
| anamorphosis | (noun) a distorted projection or perspective; especially an image distorted in such a way that it becomes visible only when viewed in a special manner | Synonyms: anamorphism |
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| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphism |
| ananas | (noun) large sweet fleshy tropical fruit with a terminal tuft of stiff leaves; widely cultivated | Synonyms: pineapple |
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| anaphylaxis | (noun) hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance | - |
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| anaplasmosis | (noun) a disease of cattle that is transmitted by cattle ticks; similar to Texas fever | - |
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| anastalsis | (noun) muscular action of the alimentary tract in a direction opposite to peristalsis | - |
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| anastomosis | (noun) a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous | Synonyms: inosculation |
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| anastylosis | (noun) the archeological reassembly of ruined monuments from fallen or decayed fragments (incorporating new materials when necessary) | - |
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| ancestress | (noun) a woman ancestor | - |
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| anchylosis | (noun) abnormal adhesion and rigidity of the bones of a joint | Synonyms: ankylosis |
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| ancientness | (noun) extreme oldness | Synonyms: antiquity |
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| ancients | (noun) people who lived in times long past (especially during the historical period before the fall of the Roman Empire in western Europe) | - |
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| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| angiitis | (noun) inflammation of a blood vessel or lymph duct | - |
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| angiogenesis | (noun) the formation of new blood vessels | - |
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| angiopteris | (noun) highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall | Synonyms: Angiopteris evecta, giant fern |
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| angriness | (noun) the state of being angry | Synonyms: anger |
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| anhidrosis | (noun) failure of the sweat glands | Synonyms: anhydrosis |
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| anhydrosis | (noun) failure of the sweat glands | Synonyms: anhidrosis |
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| animateness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: aliveness, liveness |
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| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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| animus | (noun) a feeling of ill will arousing active hostility | Synonyms: animosity, bad blood |
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| anklets | (noun) a sock that reaches just above the ankle | Synonyms: anklet, bobbysock, bobbysocks |
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| ankus | (noun) an elephant goad with a sharp spike and a hook | - |
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