| athanor | (noun) a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists | - |
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| athar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, attar, ottar |
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| atheism | (noun) a lack of belief in the existence of God or gods | - |
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| atheist | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| (noun) someone who does not believe in the existence of a god | - |
| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| athlete | (noun) a person trained to compete in sports | Synonyms: jock |
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| athletic | (adjective) relating to or befitting athletics or athletes | - |
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| (adjective) vigorously active | Synonyms: acrobatic, gymnastic |
| (adjective) having a sturdy and well proportioned body | - |
| athleticism | (noun) intense energy | Synonyms: strenuosity |
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| athletics | (noun) an active diversion requiring physical exertion and competition | Synonyms: sport |
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| (noun) participation in sports events as an extracurricular activity | - |
| (noun) a contest between athletes | Synonyms: athletic competition, athletic contest |
| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| athwart | (adverb) at an oblique angle | Synonyms: aslant, obliquely |
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| (adverb) at right angles to the center line of a ship | - |