a mineral, usually used in a powdered form. in cancer treatment, sterile talc is used to prevent pleural effusions (an abnormal collection of fluid in the space between the lungs and the chest wall). talc is inserted into the space, causing it to close up, so fluid cannot collect there. also called sterile talc powder.
出典:Wiktionary
From Middle French talc, from Arabic طَلْق (ṭalq), from Persian تلک (talk).
talc (countable かつ uncountable, 複数形 talcs)
talc (三人称単数 現在形 talcs, 現在分詞 talcing, 過去形および過去分詞形 talced)
出典:Wikipedia
出典:『Wikipedia』 (2011/08/01 23:52 UTC 版)
Talc (derived from the Persian tālk (تالک ), Arabic talk (تلك)) is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. In loose form, it is the widely-used substance known as talcum powder. It occurs as foliated to fibrous masses, its crystals being so rare as to be almost unknown. It has a perfect basal cleavage, and the folia are non-elastic, although slightly flexible. It is the softest known mineral and listed as 1 on the Mohs hardness scale. It can be easily scratched by a fingernail. It is also sectile (can be cut with a knife). It has a specific gravity of 2.5–2.8, a clear or dusty luster, and is translucent to opaque. Talc is not soluble in water, but it is slightly soluble in dilute mineral acids. Its colour ranges from white to grey or green and it has a distinctly greasy feel. Its streak is white.