Also, talcum [tal-kuhm] . a green-to-gray, soft mineral, hydrous magnesium silicate, Mg 3 (Si 4 O 10 )(OH) 2 , unctuous to the touch, and occurring usually in foliated or compact masses, used in making lubricants, talcum powder, electrical insulation, etc.
verb (used with object), talcked or talced [talkt] , talcking or talcing [tal-king] .
to treat or rub with talc.

1595–1605; < Medieval Latin talcum < Arabic ṭalq mica < Persian talk

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World English Dictionary
talc (tælk)
1.  See talcum powder
2.  a white, grey, brown, or pale green mineral, found in metamorphic rocks. It is used in the manufacture of talcum powder and electrical insulators. Composition: hydrated magnesium silicate. Formula: Mg3Si4O10(OH)2. Crystal structure: monoclinic
vb , talcs, talcking, talcked, talcs, talcing, talced
3.  (tr) to apply talc to
[C16: from Medieval Latin talcum, from Arabic talq mica, from Persian talk]

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Word Origin & History

1582, from M.Fr. talc, probably from Sp. talco and M.L. talcum "talc" (c.1317), both from Arabic talq, from Pers. talk "talc."

1558, from M.L. talcum, used for any of various shiny minerals (see talc).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

talc (tālk)
A fine-grained white, greenish, or gray mineral, having a soft soapy feel and used in talcum and face powder. Also called talcum.

talcum tal·cum (tāl'kəm)
See talc.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
talc   (tālk)  Pronunciation Key 
A very soft white, greenish, or gray monoclinic mineral usually occurring as massive micalike flakes in igneous or metamorphic rocks. It has a soapy texture and is used in face powder and talcum powder, for coating paper, and as a filler in paints and plastics. Chemical formula: Mg3Si4O10(OH)2.
The American Heritage® Science Dictionary
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