A very soft, soapy-feeling mineral that is a silicate of magnesium, sometimes with small amounts of aluminum silicate. Talc is used in making dusting powder (talcum powder), in cosmetic preparations, and as a filter aid in pharmacy. The inhalation of talc can lead to a chronic lung disease called talcosis which is related to silicosis. It occurs in workers exposed to talc mixed with silicates. Talcum powder often used to contain traces of asbestos (because talc and asbestos form under similar circumstances and are commonly found together in the earth). Since asbestos can cause cancer, it is now removed from talcum powder.
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Native hydrous magnesium silicate, sometimes containing small proportions of aluminum silicate, purified by boiling powdered t. with hydrochloric acid in water; used in pharmacy as a filter aid, as a dusting powder, and in cosmetic preparations. SYN: French chalk, soapstone, talcum. [Ar. talq]
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talc 'talk n a very soft mineral Mg3Si4O10(OH)2 that is a basic silicate of magnesium, has a soapy feel, and is used esp. in making talcum powder

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a soft white powder, consisting of magnesium silicate, used in dusting powders and skin applications. Talc used to dust surgical rubber gloves causes irritation of serous membranes, resulting in adhesions, if not washed off prior to an operation.

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(talk) a powdered hydrous form of magnesium silicate, sometimes containing a small proportion of aluminum silicate; solid lumps found in nature are called soapstone or steatite. Inhalation of the powder can cause talc pneumoconiosis. [USP] a purified form of talc used as a dusting powder and pharmaceutic aid. Called also purified t.

Medical dictionary. 2011.

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Look at other dictionaries:

  • talc — talc …   Dictionnaire des rimes

  • Talc — Catégorie IX : silicates[1] Cristaux de talc Trimous Ariège (15x6 cm Cristaux 8 mm) …   Wikipédia en Français

  • talc — [ talk ] n. m. • talk 1553; ar. talq 1 ♦ Silicate naturel de magnésium, qui se présente sous la forme de fines paillettes nacrées dans les roches métamorphiques. 2 ♦ Poudre commercialisée de cette substance. Saupoudrer de talc. ⇒ talquer. ● talc… …   Encyclopédie Universelle

  • talc — s.n. Silicat natural hidratat de magneziu, de culoare albă verzuie, unsuros şi moale la pipăit, folosit în industria farmaceutică, textilă etc. – Din fr. talc. cf. it. t a l c o , germ. T a l k . Trimis de LauraGellner, 13.09.2007. Sursa: DEX 98… …   Dicționar Român

  • tâlc — TÂLC, tâlcuri, s.n. (pop.) 1. Înţeles2, sens, rost, semnificaţie. ♢ loc. adv. Cu tâlc = cu subînţeles; cu rost, cu socoteală. ♦ Interpretare, explicaţie. 2. Glumă alegorică, fabulă, pildă. ♢ expr. A vorbi în tâlcuri = a vorbi figurat, alegoric. – …   Dicționar Român

  • Talc — Talc, n. [F. talc; cf. Sp. & It. talco, LL. talcus; all fr. Ar. talq.] (Min.) A soft mineral of a soapy feel and a greenish, whitish, or grayish color, usually occurring in foliated masses. It is hydrous silicate of magnesia. {Steatite}, or… …   The Collaborative International Dictionary of English

  • talc — (n.) 1580s, from M.Fr. talc, probably from Sp. talco and M.L. talcum talc (ealy 14c.), both from Arabic talq, from Pers. talk talc. It was applied by the Arab and medieval writers to various transparent, translucent and shining minerals such as… …   Etymology dictionary

  • talc — s. m. Sorte de pierre, qui se trouve dans les carrieres de plastre, & qui est transparente comme le verre, & se leve par feüilles. Le talc ne se calcine point, on met du talc, des feüilles de talc sur les mignatures pour les conserver. les… …   Dictionnaire de l'Académie française

  • talc — talc; talc·er; talc·ose; talc·ous; …   English syllables

  • talc — m. talc …   Diccionari Personau e Evolutiu

  • talc — [talk] n. [Fr < Ar ṭalq] 1. a soft, light colored, monoclinic mineral, Mg3Si4O10 (OH) 2, with a greasy feel, used to make talcum powder, lubricants, etc.; magnesium silicate: see MOHS SCALE 2. short for TALCUM (POWDER) vt. talcked or talced,… …   English World dictionary

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