| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acronymous | (adjective) characterized by the use of acronyms | Synonyms: acronymic |
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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| affront | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: insult |
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| (verb) treat, mention, or speak to rudely | Synonyms: diss, insult |
| agronomic | (adjective) of or relating to or promoting agronomy | Synonyms: agronomical |
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| agronomical | (adjective) of or relating to or promoting agronomy | Synonyms: agronomic |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
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| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| aleuronic | (adjective) of or related to aleurone | - |
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| allochronic | (adjective) (of taxa) occurring in different geologic times | - |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronism | (noun) an artifact that belongs to another time | - |
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| (noun) a person who seems to be displaced in time; who belongs to another age | - |
| (noun) something located at a time when it could not have existed or occurred | Synonyms: misdating, mistiming |
| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronistically | (adverb) in an anachronistic manner | - |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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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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| apron | (noun) a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing | - |
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| (noun) a paved surface where aircraft stand while not being used | - |
| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: forestage, proscenium |
| (noun) (golf) the part of the fairway leading onto the green | - |
| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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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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| asynchronism | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchrony, desynchronisation, desynchronization, desynchronizing |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| asynchrony | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, desynchronisation, desynchronization, desynchronizing |
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| baron | (noun) a British peer of the lowest rank | - |
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| (noun) a very wealthy or powerful businessman | Synonyms: big businessman, business leader, king, magnate, mogul, power, top executive, tycoon |
| (noun) a nobleman (in various countries) of varying rank | - |
| baronage | (noun) the peers of a kingdom considered as a group | Synonyms: peerage |
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| baronduki | (noun) terrestrial Siberian squirrel | Synonyms: baranduki, barunduki, burunduki, Eutamius asiaticus, Eutamius sibiricus |
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| baroness | (noun) a noblewoman who holds the rank of baron or who is the wife or widow of a baron | - |
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| baronet | (noun) a member of the British order of honor; ranks below a baron but above a knight | Synonyms: Bart |
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| baronetage | (noun) the state of a baronet | - |
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| (noun) the collective body of baronets | - |
| baronetcy | (noun) the title of a baron | - |
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| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: barony |
| baronetise | (verb) confer baronetcy upon | Synonyms: baronetize |
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| baronetize | (verb) confer baronetcy upon | Synonyms: baronetise |
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| barong | (noun) a knife resembling a cleaver; used in the Philippines | - |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| barony | (noun) the domain of a baron | - |
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| (noun) the estate of a baron | - |
| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: baronetcy |
| battlefront | (noun) the line along which opposing armies face each other | Synonyms: front, front line |
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| beachfront | (noun) a strip of land running along a beach | - |
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| 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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| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| binturong | (noun) arboreal civet of Asia having a long prehensile tail and shaggy black hair | Synonyms: Arctictis bintourong, bearcat |
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| boron | (noun) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder | Synonyms: atomic number 5, B |
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| boronic | (adjective) of or relating to boron | - |
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| bowfront | (adjective) having an outward curving front | - |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| bronc | (noun) an unbroken or imperfectly broken mustang | Synonyms: broncho, bronco |
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| bronchial | (adjective) relating to or associated with the bronchi | - |
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| bronchiolar | (adjective) of or relating to or involving bronchioles | - |
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| bronchiole | (noun) any of the smallest bronchial ducts; ending in alveoli | - |
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| bronchiolitis | (noun) inflammation of the membranes lining the bronchioles | - |
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| bronchitic | (adjective) suffering from or prone to bronchitis | - |
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| bronchitis | (noun) inflammation of the membranes lining the bronchial tubes | - |
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| broncho | (noun) an unbroken or imperfectly broken mustang | Synonyms: bronc, bronco |
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| bronchodilator | (noun) a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs | - |
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| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| bronchoscope | (noun) a slender tubular instrument used to examine the bronchial tubes | - |
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| bronchoscopic | (adjective) of or relating to an instrument for examining the interior of the bronchi | - |
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| bronchospasm | (noun) a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis | - |
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| bronchus | (noun) either of the two main branches of the trachea | Synonyms: bronchial tube |
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| bronco | (noun) an unbroken or imperfectly broken mustang | Synonyms: bronc, broncho |
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| broncobuster | (noun) a person who breaks horses | Synonyms: bronco buster, buster |
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| brontosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaurus, thunder lizard |
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| brontosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaur, thunder lizard |
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| brony | (noun) an adult, male fan of the show My Little Pony: Friendship is Magic | - |
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| bronze | (adjective) of the color of bronze | Synonyms: bronzy |
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| (adjective) made from or consisting of bronze | - |
| (noun) a sculpture made of bronze | - |
| (noun) an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin | - |
| (verb) get a tan, from wind or sun | Synonyms: tan |
| (verb) give the color and appearance of bronze to something | - |
| bronzed | (adjective) (of skin) having a tan color from exposure to the sun | Synonyms: suntanned, tanned |
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| bronzer | (noun) A cosmetic powder that comes in various shades of brown, meant to create an impression of tanned skin. | Synonyms: bronzing powder |
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| bronzy | (adjective) of the color of bronze | Synonyms: bronze |
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| buspirone | (noun) a drug (trade name BuSpar) designed specifically for anxiety | Synonyms: BuSpar |
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| caldron | (noun) a very large pot that is used for boiling | Synonyms: cauldron |
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| cauldron | (noun) a very large pot that is used for boiling | Synonyms: caldron |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chamfron | (noun) medieval plate armor to protect a horse's head | Synonyms: chanfron, front-stall, frontstall, testiere |
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| chanfron | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, front-stall, frontstall, testiere |
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| chaperon | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperone |
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| (verb) accompany as a chaperone | Synonyms: chaperone |
| chaperone | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperon |
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| (verb) accompany as a chaperone | Synonyms: chaperon |
| chevron | (noun) an inverted V-shaped charge | - |
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| (noun) V-shaped sleeve badge indicating military rank and service | Synonyms: grade insignia, stripe, stripes |