| abdominoplasty | (noun) cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach | Synonyms: tummy tuck |
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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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| alabaster | (noun) a very light white | - |
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| (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 |
| 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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| 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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| 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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| 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 | (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 |
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| 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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| 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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| 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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| 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 | - |
| asteroid | (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) | - |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| 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 | (noun) a person suffering from asthma | - |
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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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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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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 |
| 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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| 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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| 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 | (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
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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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| 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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| 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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| 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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| 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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| astronomy | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: uranology |
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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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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| bandmaster | (noun) the conductor of a band | - |
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| bast | (noun) (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes | Synonyms: phloem |
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| (noun) strong woody fibers obtained especially from the phloem of from various plants | Synonyms: bast fiber |
| bastard | (noun) derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin | Synonyms: mongrel |
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| (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, cocksucker, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
| (noun) the illegitimate offspring of unmarried parents | Synonyms: by-blow, illegitimate, illegitimate child, love child, whoreson |
| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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| bastardization | (noun) an act that debases or corrupts | Synonyms: bastardisation |
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| (noun) declaring or rendering bastard | - |
| bastardy | (noun) the status of being born to parents who were not married | Synonyms: bar sinister, illegitimacy |
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| baste | (noun) a loose temporary sewing stitch to hold layers of fabric together | Synonyms: basting, basting stitch, tacking |
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| baster | (noun) a tube with a rubber bulb used to take up and release melted fat or gravy in order to moisten roasting meat | - |
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| (noun) a sewer who fastens a garment with long loose stitches | Synonyms: tacker |
| (noun) a cook who bastes roasting meat with melted fat or gravy | - |
| bastille | (noun) a jail or prison (especially one that is run in a tyrannical manner) | - |
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| bastinado | (noun) a form of torture in which the soles of the feet are beaten with whips or cudgels | Synonyms: falanga |
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| (noun) a cudgel used to give someone a beating on the soles of the feet | - |
| basting | (noun) moistening a roast as it is cooking | - |
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| (noun) a loose temporary sewing stitch to hold layers of fabric together | Synonyms: baste, basting stitch, tacking |
| bastion | (noun) projecting part of a rampart or other fortification | - |
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| (noun) a stronghold into which people could go for shelter during a battle | Synonyms: citadel |
| (noun) a group that defends a principle | - |
| bastnaesite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnasite |
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| bastnasite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnaesite |
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| beanfeast | (noun) an annual dinner party given by an employer for the employees | - |
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| beast | (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, brute, creature, fauna |
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| (noun) a cruelly rapacious person | Synonyms: brute, savage, wildcat, wolf |
| beastliness | (noun) unpleasant nastiness; used especially of nasty weather | - |
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| (noun) the quality of being deliberately mean | Synonyms: meanness |
| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| blast | (noun) a very long fly ball | - |
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| (noun) intense adverse criticism | Synonyms: attack, fire, flack, flak |
| (noun) an explosion (as of dynamite) | - |
| (noun) a sudden very loud noise | Synonyms: bam, bang, clap, eruption |
| (noun) a highly pleasurable or exciting experience | Synonyms: good time |
| (noun) a strong current of air | Synonyms: blow, gust |
| blastema | (noun) a mass of undifferentiated cells from which an organ or body part develops | - |
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| blaster | (noun) a workman employed to blast with explosives | Synonyms: chargeman |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| blastogenesis | (noun) theory that inherited characteristics are transmitted by germ plasm | - |
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| (noun) asexual reproduction by budding | - |
| blastoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastocytoma, embryonal carcinosarcoma |
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