| abdominoplasty | (noun) cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach | Synonyms: tummy tuck |
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| abreast | (adjective) being up to particular standard or level especially in being up to date in knowledge | Synonyms: au courant, au fait, up on |
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| (adverb) alongside each other, facing in the same direction | - |
| achondroplastic | (adjective) of or relating to achondroplasia | - |
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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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| aftertaste | (noun) an afterimage of a taste | - |
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| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| (noun) a very light white | - |
| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| anaplastic | (adjective) of or relating to anaplasia | - |
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| anaplasty | (noun) surgery concerned with therapeutic or cosmetic reformation of tissue | Synonyms: plastic surgery, reconstructive surgery |
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| anastalsis | (noun) muscular action of the alimentary tract in a direction opposite to peristalsis | - |
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| anastigmat | (noun) compound lens or lens system designed to be free of astigmatism and able to form approximately point images | - |
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| anastigmatic | (adjective) not astigmatic | Synonyms: stigmatic |
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| (adjective) pertaining to a lens or lens system free of astigmatism (able to form point images) | Synonyms: stigmatic |
| anastomose | (verb) cause to join or open into each other by anastomosis | Synonyms: inosculate |
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| (verb) come together or open into each other | Synonyms: inosculate |
| 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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| anastomotic | (adjective) of or relating to or exhibiting anastomosis | - |
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| anastrophe | (noun) the reversal of the normal order of words | Synonyms: inversion |
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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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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
| antipasto | (noun) a course of appetizers in an Italian meal | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| astasia | (noun) inability to stand due to muscular incoordination | - |
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| astatic | (adjective) not static or stable | - |
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| astatine | (noun) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | Synonyms: At, atomic number 85 |
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| aster | (noun) star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis | - |
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| (noun) any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers | - |
| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| asteriated | (adjective) (of some crystals especially gemstones) exhibiting asterism | - |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| (verb) mark with an asterisk | Synonyms: star |
| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asterismal | (adjective) relating to asterisms or constellations | - |
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| astern | (adverb) (of a ship or an airplane) behind | - |
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| (adverb) at or near or toward the stern of a ship or tail of an airplane | Synonyms: abaft, aft |
| (adverb) stern foremost or backward | - |
| asternal | (adjective) not connected to the sternum or breastbone | - |
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| asteroid | (adjective) shaped like a star | Synonyms: star-shaped |
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| (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| asthenopia | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: eyestrain |
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| asthenosphere | (noun) the lower layer of the crust | - |
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| astheny | (noun) an abnormal loss of strength | Synonyms: asthenia |
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| asthma | (noun) respiratory disorder characterized by wheezing; usually of allergic origin | Synonyms: asthma attack, bronchial asthma |
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| asthmatic | (adjective) relating to breathing with a whistling sound | Synonyms: wheezing, wheezy |
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| (noun) a person suffering from asthma | - |
| astigmatic | (adjective) of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images | - |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| astilbe | (noun) any plant of the genus Astilbe having compound leaves and showy panicles of tiny colorful flowers | - |
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| astir | (adjective) on the move | Synonyms: about |
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| (adjective) out of bed | Synonyms: up |
| astomatal | (adjective) lacking a stoma or stomata | - |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astonied | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonished, astounded, stunned |
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| astonish | (verb) affect with wonder | Synonyms: amaze, astound |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| astonishingly | (adverb) in an amazing manner; to everyone's surprise | Synonyms: amazingly, surprisingly |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astound | (verb) affect with wonder | Synonyms: amaze, astonish |
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| astounded | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astonished, stunned |
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| astounding | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astonishing, staggering, stupefying |
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| (adjective) bewildering or striking dumb with wonder | Synonyms: dumbfounding, dumfounding |
| astraddle | (adverb) with one leg on each side | Synonyms: astride |
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| astragal | (noun) a beaded molding for edging or decorating furniture | Synonyms: bead, beading, beadwork |
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| (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragalus, talus |
| astragalar | (adjective) of or relating to the anklebone | - |
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| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| astrakhan | (noun) the fur of young lambs | - |
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| astral | (adjective) being or relating to or resembling or emanating from stars | Synonyms: stellar |
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| astrantia | (noun) any plant of the genus Astrantia | Synonyms: masterwort |
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| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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| astray | (adverb) away from the right path or direction | - |
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| (adverb) far from the intended target | Synonyms: wide |
| astride | (adverb) with one leg on each side | Synonyms: astraddle |
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| (adverb) with the legs stretched far apart | - |
| astringe | (verb) become constricted or compressed | - |
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| (verb) constrict or bind or draw together | - |
| astringence | (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringency |
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| astringency | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: stypsis |
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| (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringence |
| astringent | (adjective) tending to draw together or constrict soft organic tissue | - |
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| (adjective) sour or bitter in taste | Synonyms: acerb, acerbic |
| (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
| 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 |