| acciaccatura | (noun) an embellishing note usually written in smaller size | Synonyms: appoggiatura, grace note |
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| ammoniac | (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
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| amnesiac | (noun) a person suffering from amnesia | Synonyms: amnesic |
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| antiacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antacid, gastric antacid |
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| aphrodisiac | (noun) a drug or other agent that stimulates sexual desire | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| celeriac | (noun) thickened edible aromatic root of a variety of celery plant | Synonyms: celery root |
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| (noun) grown for its thickened edible aromatic root | Synonyms: Apium graveolens rapaceum, celery root, knob celery, root celery, turnip-rooted celery |
| demoniac | (noun) someone who acts as if possessed by a demon | - |
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| diacetylmorphine | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: heroin |
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| diachrony | (noun) the study of linguistic change | Synonyms: diachronic linguistics, historical linguistics |
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| diacritic | (noun) a mark added to a letter to indicate a special pronunciation | Synonyms: diacritical mark |
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| dipsomaniac | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, alky, boozer, lush, soaker, souse |
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| egomaniac | (noun) an abnormally egotistical person | - |
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| guaiac | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiacum, lignum vitae |
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| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| haemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, hemophile, hemophiliac |
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| hemiacetal | (noun) an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones | - |
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| hemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, haemophiliac, hemophile |
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| hypochondriac | (noun) a patient with imaginary symptoms and ailments | - |
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| immediacy | (noun) the quickness of action or occurrence | Synonyms: immediateness, instancy, instantaneousness |
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| (noun) lack of an intervening or mediating agency | Synonyms: immediateness |
| (noun) immediate intuitive awareness | Synonyms: immediate apprehension |
| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| maniac | (noun) an insane person | Synonyms: lunatic |
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| (noun) a person who has an obsession with or excessive enthusiasm for something | - |
| mariachi | (noun) a group of street musicians in Mexico | - |
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| mediacy | (noun) the quality of being mediate | Synonyms: mediateness |
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| megalomaniac | (noun) a pathological egotist | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| microgliacyte | (noun) a cell of the microglia that may become phagocytic and collect waste products of nerve tissue | - |
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| monomaniac | (noun) a person suffering from monomania | - |
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| neurogliacyte | (noun) a cell of the neuroglia | Synonyms: glial cell, neuroglial cell |
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| niacin | (noun) a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract | Synonyms: nicotinic acid |
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| nymphomaniac | (noun) a woman with abnormal sexual desires | Synonyms: nympho |
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| paranoiac | (noun) a person afflicted with paranoia | Synonyms: paranoid |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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| triacetate | (noun) cellulose acetate that is relatively slow to burn; used instead of celluloid for motion-picture film | Synonyms: cellulose triacetate |
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| zodiac | (noun) (astrology) a circular diagram representing the 12 zodiacal constellations and showing their signs | - |
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| (noun) a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes | - |