| almanac | (noun) an annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year | - |
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| (noun) an annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given year | Synonyms: farmer's calendar |
| 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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| aphrodisiac | (noun) a drug or other agent that stimulates sexual desire | - |
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| bivouac | (noun) temporary living quarters specially built by the army for soldiers | Synonyms: camp, cantonment, encampment |
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| (noun) a site where people on holiday can pitch a tent | Synonyms: campground, camping area, camping ground, camping site, campsite, encampment |
| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| calpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpack, kalpac |
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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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| 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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| etodolac | (noun) a nonsteroidal anti-inflammatory drug (trade name Lodine) | Synonyms: Lodine |
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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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| haemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, hemophile, hemophiliac |
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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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| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| ipecac | (noun) a medicinal drug used to evoke vomiting (especially in cases of drug overdose or poisoning) | - |
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| kalpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpac, calpack |
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| ketorolac | (noun) nonsteroidal anti-inflammatory (trade name Torodal) that is given only orally | Synonyms: Torodal |
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| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| lac | (noun) resinlike substance secreted by certain lac insects; used in e.g. varnishes and sealing wax | - |
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| lilac | (noun) any of various plants of the genus Syringa having large panicles of usually fragrant flowers | - |
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| linac | (noun) ions are accelerated along a linear path by voltage differences on electrodes along the path | Synonyms: linear accelerator |
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| mac | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: macintosh, mack, mackintosh |
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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 | - |
| medevac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medical evacuation, medivac |
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| medivac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medevac, medical evacuation |
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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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| monomaniac | (noun) a person suffering from monomania | - |
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| muntjac | (noun) small Asian deer with small antlers and a cry like a bark | Synonyms: barking deer |
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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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| ricrac | (noun) a narrow zigzag ribbon used as trimming | Synonyms: rickrack |
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| sac | (noun) a structure resembling a bag in an animal | - |
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| (noun) a case or sheath especially a pollen sac or moss capsule | Synonyms: theca |
| (noun) an enclosed space | Synonyms: pocket, pouch, sack |
| sandarac | (noun) a brittle and faintly aromatic translucent resin used in varnishes | Synonyms: sandarach |
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| (noun) large coniferous evergreen tree of North Africa and Spain having flattened branches and scalelike leaves yielding a hard fragrant wood; bark yields a resin used in varnishes | Synonyms: Callitris quadrivalvis, sandarac tree, Tetraclinis articulata |
| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: citronwood |
| shellac | (noun) a thin varnish made by dissolving lac in ethanol; used to finish wood | Synonyms: shellac varnish |
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| (noun) lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white | - |
| shumac | (noun) a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus) | Synonyms: sumac, sumach |
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| sulindac | (noun) a nonsteroidal anti-inflammatory drug (trade name Clinoril) | Synonyms: Clinoril |
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| sumac | (noun) a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus) | Synonyms: shumac, sumach |
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| (noun) wood of a sumac | - |
| tacamahac | (noun) poplar of northeastern North America with broad heart-shaped leaves | Synonyms: balsam poplar, hackmatack, Populus balsamifera |
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| tambac | (noun) an alloy of copper and zinc (and sometimes arsenic) used to imitate gold in cheap jewelry and for gilding | Synonyms: tombac, tombak |
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| tarmac | (noun) a paved surface having compressed layers of broken rocks held together with tar | Synonyms: macadam, tarmacadam |
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| (noun) a paving material of tar and broken stone; mixed in a factory and shaped during paving | Synonyms: tarmacadam |
| tendrac | (noun) small often spiny insectivorous mammal of Madagascar; resembles a hedgehog | Synonyms: tenrec |
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| tictac | (noun) steady recurrent ticking sound as made by a clock | Synonyms: ticktock, tocktact |
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| tombac | (noun) an alloy of copper and zinc (and sometimes arsenic) used to imitate gold in cheap jewelry and for gilding | Synonyms: tambac, tombak |
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| vac | (noun) informal term for vacation | Synonyms: vacay |
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| yashmac | (noun) the face veil worn by Muslim women | Synonyms: yashmak |
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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 | - |