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raphides

[raf-i-deez] /ˈræf ɪˌdiz/
plural noun, singular raphide [rey-fahyd] /ˈreɪ faɪd/ (Show IPA), raphis [rey-fis] /ˈreɪ fɪs/ (Show IPA). Botany
1.
acicular crystals, usually composed of calcium oxalate, that occur in bundles in the cells of many plants.
Origin
1835-1845
1835-45; < New Latin < Greek rhaphídes, plural of rhaphís needle
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for raphis

raphide

/ˈreɪfaɪd/
noun (pl) raphides (ˈræfɪˌdiːz)
1.
any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
Word Origin
C18: from French, from Greek rhaphis needle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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