| automatism | (noun) any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy) | - |
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| automatize | (verb) make automatic or control or operate automatically | Synonyms: automate, automatise |
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| (verb) turn into an automaton | Synonyms: automatise |
| automaton | (noun) a mechanism that can move automatically | Synonyms: golem, robot |
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| (noun) a machine that operates on its own without the need for human control | - |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: zombi, zombie |
| automatonlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, machinelike, robotic, robotlike |
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| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| (verb) travel in an automobile | - |
| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| automotive | (adjective) of or relating to motor vehicles | - |
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| (adjective) containing within itself the means of propulsion or movement | Synonyms: self-propelled, self-propelling |
| automysophobia | (noun) a morbid fear of being dirty | - |
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| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| autonomy | (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: liberty |
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| (noun) personal independence | Synonyms: self-direction, self-reliance, self-sufficiency |
| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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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 |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| (verb) perform an autopsy on a dead body; do a post-mortem | - |
| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| autosemantic | (adjective) of a word or phrase meaningful in isolation, independent of context | - |
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| autosexing | (noun) (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching | - |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| autotelic | (adjective) of or relating to or believing in autotelism | - |
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| autotelism | (noun) belief that a work of art is an end in itself or its own justification | - |
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| autotomic | (adjective) of or relating to autotomy | - |
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| autotomise | (verb) cause a body part to undergo autotomy | Synonyms: autotomize |
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| autotomize | (verb) cause a body part to undergo autotomy | Synonyms: autotomise |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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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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| autotype | (noun) an exact copy or reproduction | Synonyms: facsimile |
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| (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotypy |
| autotypic | (adjective) of or relating to autotypy | - |
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| autotypy | (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotype |
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| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| ayatollah | (noun) a high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as well | - |
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| backstop | (noun) a precaution in case of an emergency | - |
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| (noun) (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field | - |
| (noun) (baseball) the person who plays the position of catcher | Synonyms: catcher |
| (verb) act as a backstop | - |
| badminton | (noun) a game played on a court with light long-handled rackets used to volley a shuttlecock over a net | - |
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| balletomane | (noun) a ballet enthusiast | - |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| baritone | (adjective) lower in range than tenor and higher than bass | - |
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| (noun) the second lowest brass wind instrument | Synonyms: baritone horn |
| (noun) the second lowest adult male singing voice | Synonyms: baritone voice |
| (noun) a male singer | Synonyms: barytone |
| barnstorm | (verb) tour the country making political speeches, giving lectures, or presenting plays | - |
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| (verb) appear at county fairs and carnivals as a stunt flier and parachute jumper | - |
| barnstormer | (noun) a pilot who travels around the country giving exhibits of stunt flying and parachuting | Synonyms: stunt flier, stunt pilot |
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| (noun) an actor who travels around the country presenting plays | Synonyms: play-actor, playactor, trouper |
| baroreceptor | (noun) a sensory receptor that responds to pressure | - |
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| barrator | (noun) someone guilty of barratry | Synonyms: barrater |
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| bartonia | (noun) annual grown especially for its fragrant golden nocturnal flowers | Synonyms: Mentzelia lindleyi |
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| barytone | (noun) a male singer | Synonyms: baritone |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| baton | (noun) a thin tapered rod used by a conductor to lead an orchestra or choir | Synonyms: wand |
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| (noun) a hollow cylinder passed from runner to runner in a relay race | - |
| (noun) a hollow metal rod that is wielded or twirled by a drum major or drum majorette | - |
| (noun) a short staff carried by some officials to symbolize an office or an authority | - |
| (noun) a short stout club used primarily by policemen | Synonyms: billy, billy club, billystick, nightstick, truncheon |
| bellbottom | (adjective) (of trousers) having legs that flare at the bottom | Synonyms: bell-bottom, bell-bottomed |
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| bellybutton | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, navel, omphalos, omphalus, umbilicus |
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| benedictory | (adjective) expressing benediction | Synonyms: benedictive |
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| benefactor | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: helper |
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| bentonite | (noun) an absorbent aluminum silicate clay formed from volcanic ash | - |
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| bentonitic | (adjective) of or relating to or containing bentonite | - |
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| bestow | (verb) present | Synonyms: confer |
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| (verb) bestow a quality on | Synonyms: add, bring, contribute, impart, lend |
| (verb) give as a gift | - |
| bestowal | (noun) the act of conferring an honor or presenting a gift | Synonyms: bestowment, conferment, conferral |
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| (noun) a gift that is bestowed or conferred | Synonyms: bestowment |
| bestower | (noun) person who makes a gift of property | Synonyms: conferrer, donor, giver, presenter |
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| bestowment | (noun) the act of conferring an honor or presenting a gift | Synonyms: bestowal, conferment, conferral |
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| (noun) a gift that is bestowed or conferred | Synonyms: bestowal |
| betoken | (verb) indicate, as with a sign or an omen | Synonyms: augur, auspicate, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
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| (verb) be a signal for or a symptom of | Synonyms: bespeak, indicate, point, signal |
| bettong | (noun) short-nosed rat kangaroo | - |
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| bettor | (noun) someone who bets | Synonyms: better, punter, wagerer |
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| bialystoker | (noun) flat crusty-bottomed onion roll | Synonyms: bialy |
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| bilestone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: gallstone |
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| biltong | (noun) meat that is salted and cut into strips and dried in the sun | - |
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| bimotored | (adjective) having two motors | - |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| bitok | (noun) a Russian dish made with patties of ground meat (mixed with onions and bread and milk) and served with a sauce of sour cream | - |
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| bitstock | (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: brace |
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| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| (verb) coat with blacktop | - |
| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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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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| blastocoelic | (adjective) of or relating to a 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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| blastodermatic | (adjective) of or relating to a blastoderm | Synonyms: blastodermic |
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| blastodermic | (adjective) of or relating to a blastoderm | Synonyms: blastodermatic |
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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 | - |
| blastogenetic | (adjective) of or relating to blastogenesis | - |
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| blastoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastocytoma, embryonal carcinosarcoma |
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| blastomere | (noun) any cell resulting from cleavage of a fertilized egg | - |
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| blastomeric | (adjective) of or relating to a blastomere | - |
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| blastomycete | (noun) any of various yeastlike budding fungi of the genus Blastomyces; cause disease in humans and other animals | - |
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| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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| blastomycotic | (adjective) of or relating to or characteristic of blastomycosis | - |
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| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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