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sylvite

[sil-vahyt]
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noun
  1. a common mineral, potassium chloride, KCl, colorless to milky-white or red, occurring in crystals, usually cubes, and masses with cubic cleavage, bitter in taste: the most important source of potassium.
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Also syl·vin, syl·vine [sil-vin] /ˈsɪl vɪn/.

Origin of sylvite

1965–70; < Latin (sal digestīvus) Sylvi(ī) digestive salt of Sylvius (see Sylvian fissure) + -ite1; replacing sylvine < French
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sylvite

sylvite

sylvine (ˈsɪlviːn)

noun
  1. a soluble colourless, white, or coloured mineral consisting of potassium chloride in cubic crystalline form with sodium impurities: it occurs chiefly in sedimentary beds and is an important ore of potassium. Formula: KCl
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Word Origin

C19: sylvite, alteration of sylvine, from New Latin sal digestiva Sylvii digestive salt of Sylvius, after Franciscus Sylvius (died 1672), German anatomist. See -ite 1, -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012