thiourea
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oʊBased on the Random House Dictionary, © Random House, Inc. 2013.
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thiourea (ˌθaɪəʊˈjʊərɪə) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| a white water-soluble crystalline substance with a bitter taste that forms addition compounds with metal ions and is used in photographic fixing, rubber vulcanization, and the manufacture of synthetic resins. Formula: H2NCSNH2 | |
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| the offspring of a zebra and a donkey. |
| a scrap or morsel of food left at a meal. |
thiourea (thī'ō-y -rē'ə) Pronunciation Key
A lustrous white crystalline compound used as a developer in photography and photocopying and in various organic syntheses. Thiourea has the same structure as urea, but with a sulfur atom in place of the oxygen atom. Chemical formula: CH4N2S. |
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thiourea
an organic compound that resembles urea (q.v.) but contains sulfur instead of oxygen; i.e., the molecular formula is CS(NH2)2, while that of urea is CO(NH2)2. Like urea, it can be prepared by causing a compound with the same chemical composition to undergo rearrangement, as by heating ammonium thiocyanate (NH4SCN). A method of preparation more commonly used consists of the addition of hydrogen sulfide to cyanamide. Thiourea exhibits many of the chemical properties of urea, but it has little commercial application. The small quantity of thiourea consumed is utilized primarily in photography as a fixing agent, in the manufacture of a thermosetting resin, as an insecticide, as a textile-treating agent, and as starting material for certain dyes and drugs. Thiourea forms as colourless crystals melting at 182 C (360 F). It is toxic, although the fatal dosage is not well established
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