| auto | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: automobile, car, machine, motorcar |
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| autoalarm | (noun) a radio receiving device used on ships that rings an alarm bell when a distress signal is received. | Synonyms: auto-alarm |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autobahn | (noun) an expressway in a German-speaking country | - |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autobiographic | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographical |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographical |
| autobiographical | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographic |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographic |
| autobiography | (noun) a biography of yourself | - |
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| autobus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| autochthon | (noun) the earliest known inhabitants of a region | - |
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| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| (verb) subject to the action of an autoclave | - |
| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autocorrect | (noun) a system for automatically correcting text | - |
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| autocracy | (noun) a political theory favoring unlimited authority by a single individual | - |
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| (noun) a political system governed by a single individual | Synonyms: autarchy |
| autocrat | (noun) a cruel and oppressive dictator | Synonyms: despot, tyrant |
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| autocratic | (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: bossy, dominating, high-and-mighty, magisterial, peremptory |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, despotic, dictatorial, tyrannic, tyrannical |
| autocratically | (adverb) in an autocratic manner | - |
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| (adverb) in an overbearingly domineering manner; as a dictator | Synonyms: dictatorially, magisterially |
| autocue | (noun) a device that displays words for people to read | Synonyms: prompter |
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| autodidact | (noun) a person who has taught himself | - |
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| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autoerotic | (adjective) sexually satisfying yourself (as by masturbation) | - |
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| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| autoerotism | (noun) using your own body as a sexual object | Synonyms: autoeroticism |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| autogamic | (adjective) characterized by or fit for autogamy | Synonyms: autogamous |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogamy | (noun) self-fertilization in plants | - |
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| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autogenetic | (adjective) of or relating to autogenesis | - |
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| autogenic | (adjective) originating within the body | Synonyms: autogenous |
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| autogenics | (noun) training patients in self-induced relaxation | Synonyms: autogenic therapy, autogenic training |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autogeny | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogenesis, spontaneous generation |
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| autogiro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogyro, gyroplane |
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| autograft | (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autoplasty |
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| autograph | (noun) something written by one's own hand | - |
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| (noun) a person's own signature | Synonyms: John Hancock |
| (verb) mark with one's signature | Synonyms: inscribe |
| autographed | (adjective) bearing an autograph | - |
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| autographic | (adjective) written in the author's own handwriting | - |
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| autogyro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, gyroplane |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autoimmune | (adjective) of or relating to the immune response of the body against substance normally present in the body | - |
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| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| autolytic | (adjective) of or relating to self-digestion | - |
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| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| automat | (noun) a cafeteria where food is served from machines | - |
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| (noun) a vending machine from which you can get food | - |
| automate | (verb) make automatic or control or operate automatically | Synonyms: automatise, automatize |
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| automated | (adjective) operated by automation | Synonyms: machine-controlled, machine-driven |
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| automatic | (adjective) operating with minimal human intervention; independent of external control | - |
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| (adjective) without volition or conscious control | Synonyms: reflex, reflexive |
| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatonlike, machinelike, robotic, robotlike |
| (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |
| automatically | (adverb) in a reflex manner | - |
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| (adverb) in a mechanical manner; by a mechanism | Synonyms: mechanically |
| automation | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: mechanisation, mechanization |
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| (noun) equipment used to achieve automatic control or operation | - |
| (noun) the condition of being automatically operated or controlled | - |
| automatise | (verb) make automatic or control or operate automatically | Synonyms: automate, automatize |
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| (verb) turn into an automaton | Synonyms: automatize |
| 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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