| ambiguous | (adjective) having more than one possible meaning | - |
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| (adjective) open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead | Synonyms: equivocal |
| (adjective) having no intrinsic or objective meaning; not organized in conventional patterns | - |
| ambitionless | (adjective) having little desire for success or achievement | Synonyms: unambitious |
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| ambitious | (adjective) having a strong desire for success or achievement | - |
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| (adjective) requiring full use of your abilities or resources | Synonyms: challenging |
| 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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| amebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amoeban, amoebic, amoebous |
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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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| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amentiferous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentaceous |
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| ametabolous | (adjective) undergoing slight or no metamorphosis | Synonyms: ametabolic |
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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 |
| amidships | (adverb) at or near or toward the center of a ship | Synonyms: amidship, midships |
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| amiss | (adjective) not functioning properly | Synonyms: awry, haywire, wrong |
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| (adverb) away from the correct or expected course | Synonyms: awry |
| (adverb) in an improper or mistaken or unfortunate manner | - |
| (adverb) in an imperfect or faulty way | Synonyms: imperfectly |
| 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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| amoebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebic |
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| amorous | (adjective) inclined toward or displaying love | Synonyms: amative |
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| (adjective) expressive of or exciting sexual love or romance | Synonyms: amatory, romantic |
| 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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| amorphous | (adjective) lacking the system or structure characteristic of living bodies | Synonyms: unstructured |
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| (adjective) without real or apparent crystalline form | Synonyms: uncrystallised, uncrystallized |
| (adjective) unclear because vague or badly organized | - |
| (adjective) having no definite form or distinct shape | Synonyms: formless, shapeless |
| (adjective) (of a group of people or an organization) unorganized or unfocused | - |
| amphibious | (adjective) operating or living on land and in water | - |
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| (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibian |
| 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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| amphitropous | (adjective) (of a plant ovule) partly inverted; turned back 90 degrees on its stalk | - |
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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 | - |
| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| 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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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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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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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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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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| analogous | (adjective) corresponding in function but not in evolutionary origin | - |
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| (adjective) similar or equivalent in some respects though otherwise dissimilar | Synonyms: correspondent |
| 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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| anasarcous | (adjective) characterized by or affected by dropsy | - |
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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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| anatropous | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: inverted |
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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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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |
| anemophilous | (adjective) of flowering plants (especially grasses etc) that are pollinated by the wind | - |
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| anencephalous | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalic |
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| anestrous | (adjective) (of lower mammals) not in a state of estrus; not in heat | - |
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| (adjective) of or relating to anestrus | Synonyms: anestric, anoestrous |
| 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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| anfractuous | (adjective) full of twists and turns | - |
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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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| anginous | (adjective) of or related to the pain of angina pectoris | Synonyms: anginal, anginose |
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| angiocarpous | (adjective) having or being fruit enclosed in a shell or husk | Synonyms: angiocarpic |
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| angiogenesis | (noun) the formation of new blood vessels | - |
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| angiomatous | (adjective) of or related to or having a tumor of the kind known as an angioma | - |
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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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| angiospermous | (adjective) of or related to or characteristic of plants that are angiosperms | - |
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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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| anhydrous | (adjective) without water; especially without water of crystallization | - |
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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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| anisogamous | (adjective) relating to a type of sexual reproduction in which the gametes are dissimilar in some respect (as size or shape) | Synonyms: anisogamic |
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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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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| ankylosis | (noun) abnormal adhesion and rigidity of the bones of a joint | Synonyms: anchylosis |
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| annals | (noun) a chronological account of events in successive years | Synonyms: chronological record |
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| (noun) reports of the work of a society or learned body etc | - |
| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| anomalops | (noun) fish having a luminous organ beneath eye; of warm waters of the western Pacific and Puerto Rico | Synonyms: flashlight fish |
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| anomalous | (adjective) deviating from the general or common order or type | - |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anonymous | (adjective) having no known name or identity or known source | Synonyms: anon. |
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| (adjective) not known or lacking marked individuality | - |
| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| anthesis | (noun) the time and process of budding and unfolding of blossoms | Synonyms: blossoming, efflorescence, florescence, flowering, inflorescence |
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| anthophagous | (adjective) feeding on flowers | Synonyms: anthophilous |
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| anthophilous | (adjective) feeding on flowers | Synonyms: anthophagous |
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| anthracosis | (noun) lung disease caused by inhaling coal dust | Synonyms: black lung, black lung disease, coal miner's lung |
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