| ammoniac | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniacal |
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| (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
| amnesiac | (adjective) suffering from a partial loss of memory | Synonyms: amnesic |
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| (noun) a person suffering from amnesia | Synonyms: amnesic |
| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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| aphrodisiac | (adjective) stimulating sexual desire | Synonyms: aphrodisiacal, sexy |
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| (noun) a drug or other agent that stimulates sexual desire | - |
| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| cardiac | (adjective) of or relating to the heart | - |
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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 |
| celiac | (adjective) of or in or belonging to the cavity of the abdomen | Synonyms: coeliac |
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| (adjective) belonging to or prescribed for celiac disease | - |
| coeliac | (adjective) of or in or belonging to the cavity of the abdomen | Synonyms: celiac |
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| demoniac | (adjective) of, pertaining to, or like a demon or possession by a demon | Synonyms: demoniacal, possessed |
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| (noun) someone who acts as if possessed by a demon | - |
| 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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| elegiac | (adjective) resembling or characteristic of or appropriate to an elegy | - |
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| (adjective) expressing sorrow often for something past | - |
| 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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| haemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, hemophile, hemophiliac |
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| heliac | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliacal |
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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 | (adjective) suffering from hypochondria | Synonyms: hypochondriacal |
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| (noun) a patient with imaginary symptoms and ailments | - |
| iliac | (adjective) of or relating to the ilium | - |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| (noun) someone who cannot sleep | Synonyms: sleepless person |
| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| maniac | (adjective) wildly disordered | Synonyms: maniacal |
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| (noun) an insane person | Synonyms: lunatic |
| (noun) a person who has an obsession with or excessive enthusiasm for something | - |
| megalomaniac | (noun) a pathological egotist | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| monomaniac | (noun) a person suffering from monomania | - |
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| nymphomaniac | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniacal |
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| (noun) a woman with abnormal sexual desires | Synonyms: nympho |
| paradisiac | (adjective) relating to or befitting Paradise | Synonyms: paradisaic, paradisaical, paradisal, paradisiacal |
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| paranoiac | (noun) a person afflicted with paranoia | Synonyms: paranoid |
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| pericardiac | (adjective) located around the heart or relating to or affecting the pericardium | Synonyms: pericardial |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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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 | - |