| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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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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| adrenocorticotropic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotrophic |
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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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| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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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 |
| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| allotrope | (noun) a structurally different form of an element | - |
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| allotropic | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropical |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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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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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| ametropic | (adjective) of or relating to an abnormal condition of the eye in which visual images are not in focus on the retina | - |
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| amphitropous | (adjective) (of a plant ovule) partly inverted; turned back 90 degrees on its stalk | - |
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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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| anatropous | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: inverted |
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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 |
| angstrom | (noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation | Synonyms: A, angstrom unit |
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| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anisometropic | (adjective) relating to a difference in the refractive power of the two eyes | - |
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| anisotropic | (adjective) not invariant with respect to direction | - |
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| anisotropically | (adverb) in an anisotropic manner | - |
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| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antineutron | (noun) the antiparticle of a neutron | - |
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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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| antistrophic | (adjective) of or relating to an antistrophe | - |
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| antrorse | (adjective) bent or curved forward or upward | - |
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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 | - |
| apostrophic | (adjective) of or characteristic of apostrophe | - |
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| apostrophise | (verb) use an apostrophe | Synonyms: apostrophize |
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| apostrophize | (verb) use an apostrophe | Synonyms: apostrophise |
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| apotropaic | (adjective) having the power to prevent evil or bad luck | - |
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| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| astrocyte | (noun) comparatively large neuroglial cell | - |
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| astrocytic | (adjective) of or relating to or containing large star-shaped cells in the neuroglia | - |
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| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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| astrogate | (verb) navigate in space | - |
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| (verb) guide in interplanetary travel | - |
| astrogator | (noun) the navigator of a spacecraft | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| astrolabe | (noun) an early form of sextant | - |
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| astrolatry | (noun) the worship of planets or stars | Synonyms: worship of heavenly bodies |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| astronomic | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomical |
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| (adjective) inconceivably large | Synonyms: astronomical, galactic |
| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astronomically | (adverb) enormously | - |
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| astronomy | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: uranology |
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| astrophysical | (adjective) of or concerned with astrophysics | - |
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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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| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| atrociously | (adverb) in a terrible manner | Synonyms: abominably, abysmally, awfully, rottenly, terribly |
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| (adverb) to an extravagant or immoderate degree | Synonyms: outrageously |
| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| atrocity | (noun) an act of atrocious cruelty | Synonyms: inhumanity |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, barbarity, barbarousness, heinousness |
| 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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| atrophic | (adjective) relating to or characterized by atrophy | - |
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| atrophied | (adjective) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use | Synonyms: diminished, wasted |
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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 |
| (verb) undergo atrophy | - |
| 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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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| backstroke | (noun) a swimming stroke that resembles the crawl except the swimmer lies on his or her back | - |
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| (verb) swim on one's back | - |
| backstroker | (noun) someone who swims the backstroke | - |
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| beetroot | (noun) round red root vegetable | Synonyms: beet |
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| (noun) beet having a massively swollen red root; widely grown for human consumption | Synonyms: Beta vulgaris rubra |
| betatron | (noun) accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux | Synonyms: induction accelerator |
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| betroth | (verb) give to in marriage | Synonyms: affiance, engage, plight |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |
| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bistro | (noun) a small informal restaurant; serves wine | - |
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| bistroic | (adjective) of or relating to or resembling a bistro | - |
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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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| boustrophedonic | (adjective) of or relating to writing alternate lines in opposite directions | - |
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| boytrose | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, botryoidal |
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| breaststroke | (noun) a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick | - |
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| (verb) swim with the face down and extend the arms forward and outward while kicking with the leg | - |
| breaststroker | (noun) someone who swims the breaststroke | - |
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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 |
| campylotropous | (adjective) (of a plant ovule) curved with the micropyle near the base almost touching its stalk | - |
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| cartroad | (noun) any road or path affording passage especially a rough one | Synonyms: cart track, track |
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