talc

[talk]
noun
1.
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] .
3.
to treat or rub with talc.

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

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World English Dictionary
talc (tælk)
 
n
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]
 
'talcose
 
adj
 
'talcous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

talc
1582, from M.Fr. talc, probably from Sp. talco and M.L. talcum "talc" (c.1317), both from Arabic talq, from Pers. talk "talc."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is not yet known whether wet talc is more effective than dry talc in treating patients with malignant pleural effusion.
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