| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| acrophobia | (noun) a morbid fear of great heights | - |
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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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| acropolis | (noun) the citadel in ancient Greek towns | - |
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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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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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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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| 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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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
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| allotrope | (noun) a structurally different form of an element | - |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| amyotrophia | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophy |
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| amyotrophy | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophia |
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| anastrophe | (noun) the reversal of the normal order of words | Synonyms: inversion |
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| androphobia | (noun) a morbid fear of men | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropocentrism | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentricity |
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| anthropogenesis | (noun) the evolution or genesis of the human race | Synonyms: anthropogeny |
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| anthropogeny | (noun) the evolution or genesis of the human race | Synonyms: anthropogenesis |
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| anthropoid | (noun) any member of the suborder Anthropoidea including monkeys and apes and hominids | - |
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| (noun) person who resembles a nonhuman primate | Synonyms: ape |
| anthropolatry | (noun) the worship of human beings | Synonyms: worship of man |
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| anthropologism | (noun) a point of view in which human nature is exhaustively determined by the culture in which a person lives, leaving no room for human agency. | - |
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| anthropologist | (noun) a social scientist who specializes in anthropology | - |
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| anthropology | (noun) the social science that studies the origins and social relationships of human beings | - |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| anthropomorphism | (noun) the representation of objects (especially a god) as having human form or traits | Synonyms: theanthropism |
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| anthropopathism | (noun) Attribution of human feelings to things not human, such as inanimate objects, animals, or natural phenomena. | - |
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| anthropophagite | (noun) a person who eats human flesh | Synonyms: anthropophagus, cannibal, man-eater |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| anthropophagy | (noun) human cannibalism; the eating of human flesh | - |
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| anthroposophy | (noun) a system of beliefs and practices based on the philosophy of Rudolf Steiner; it claims to integrate the practical and psychological in child-centered education | - |
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| antistrophe | (noun) the section of a choral ode answering a previous strophe in classical Greek drama; the second of two metrically corresponding sections in a poem | - |
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| apostrophe | (noun) address to an absent or imaginary person | - |
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| (noun) the mark (') used to indicate the omission of one or more letters from a printed word | - |
| appropriateness | (noun) the quality of being specially suitable | - |
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| (noun) appropriate conduct; doing the right thing | Synonyms: rightness |
| appropriation | (noun) a deliberate act of acquisition of something, often without the permission of the owner | - |
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| (noun) incorporation by joining or uniting | Synonyms: annexation |
| (noun) money set aside (as by a legislature) for a specific purpose | - |
| appropriator | (noun) someone who takes for his or her own use (especially without permission) | - |
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| arthropathy | (noun) a pathology or abnormality of a joint | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| arthropod | (noun) invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin | - |
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| astrophysicist | (noun) an astronomer who studies the physical properties of celestial bodies | - |
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| astrophysics | (noun) the branch of astronomy concerned with the physical and chemical properties of celestial bodies | - |
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| atrophedema | (noun) recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs | Synonyms: angioedema, giant hives, periodic edema, Quincke's edema |
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| atrophy | (noun) any weakening or degeneration (especially through lack of use) | Synonyms: withering |
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| (noun) a decrease in size of an organ caused by disease or disuse | Synonyms: wasting, wasting away |
| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| boustrophedon | (noun) an ancient writing system: having alternate lines written in opposite directions; literally `as the ox ploughs' | - |
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| caltrop | (noun) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed | Synonyms: devil's weed, Tribulus terestris |
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| (noun) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | Synonyms: Centauria calcitrapa, star-thistle |
| (noun) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | Synonyms: water chestnut, water chestnut plant |
| catastrophe | (noun) an event resulting in great loss and misfortune | Synonyms: calamity, cataclysm, disaster, tragedy |
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| (noun) a sudden violent change in the earth's surface | Synonyms: cataclysm |
| (noun) a state of extreme (usually irremediable) ruin and misfortune | Synonyms: disaster |
| cecropia | (noun) North American silkworm moth; larvae feed on the leaves of forest trees | Synonyms: cecropia moth, Hyalophora cecropia |
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| ceroplastics | (noun) the art of modeling in wax. | - |
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| chemoautotroph | (noun) An organism that depends on chemicals for its energy and principally on carbon dioxide for its carbon. | Synonyms: chemotrophic autotroph |
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| chiropodist | (noun) a specialist in care for the feet | Synonyms: foot doctor, podiatrist |
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| chiropody | (noun) the branch of medicine concerned with the feet | Synonyms: podiatry |
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| chiropractic | (noun) a method of treatment that manipulates body structures (especially the spine) to relieve low back pain or even headache or high blood pressure | - |
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| chiropractor | (noun) a therapist who practices chiropractic | - |
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| chiropteran | (noun) nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate | Synonyms: bat |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| chlorophyte | (noun) algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water | Synonyms: green algae |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chloroplatinate | (noun) any salt of chloroplatinic acid. | - |
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| chloroprene | (noun) derivative of butadiene used in making neoprene by polymerization | - |
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| chondrodystrophy | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, achondroplasty, osteosclerosis congenita |
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| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| coprophagia | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagy |
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| coprophagy | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagia |
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| corticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotropin |
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| corticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin |
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| counterproposal | (noun) a proposal offered as an alternative to an earlier proposal | - |
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| crop | (noun) a pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food | Synonyms: craw |
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| (noun) the stock or handle of a whip | - |
| (noun) the output of something in a season | - |
| (noun) a collection of people or things appearing together | - |
| (noun) the yield from plants in a single growing season | Synonyms: harvest |
| (noun) a cultivated plant that is grown commercially on a large scale | - |
| cropper | (noun) small farmers and tenants | Synonyms: sharecrop farmer, sharecropper |
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| cyclopropane | (noun) a colorless flammable gas sometimes used as an inhalation anesthetic | - |
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| dewdrop | (noun) a drop of dew | - |
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| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| disproportion | (noun) lack of proportion; imbalance among the parts of something | Synonyms: dissymmetry, imbalance |
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| drop | (noun) the act of dropping something | - |
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| (noun) a central depository where things can be left or picked up | - |
| (noun) a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery | Synonyms: drop cloth, drop curtain |
| (noun) a sudden sharp decrease in some quantity | Synonyms: dip, fall, free fall |
| (noun) a free and rapid descent by the force of gravity | Synonyms: fall |
| (noun) a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property) | - |
| (noun) a steep high face of rock | Synonyms: cliff, drop-off |
| (noun) a small indefinite quantity (especially of a liquid) | Synonyms: drib, driblet |
| (noun) a shape that is spherical and small | Synonyms: bead, pearl |
| dropkick | (noun) (football) kicking (as for a field goal) in which the football is dropped and kicked as it touches the ground | - |
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| dropkicker | (noun) a football kicker who drops the ball and kicks it just as it reaches the ground | - |
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| droplet | (noun) a tiny drop | - |
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| dropline | (noun) a headline with the top line flush left and succeeding lines indented to the right | Synonyms: drop line, stagger head, staggered head, stephead, stepped line |
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| dropout | (noun) someone who quits school before graduation | - |
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| (noun) someone who withdraws from a social group or environment | - |
| dropper | (noun) pipet consisting of a small tube with a vacuum bulb at one end for drawing liquid in and releasing it a drop at a time | Synonyms: eye dropper |
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