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raphides

[raf-i-deez]
plural noun, singular ra·phide [rey-fahyd] /ˈreɪ faɪd/, ra·phis [rey-fis] /ˈreɪ fɪs/. Botany.
  1. acicular crystals, usually composed of calcium oxalate, that occur in bundles in the cells of many plants.
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Origin of raphides

1835–45; < New Latin < Greek rhaphídes, plural of rhaphís needle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for raphide

raphide

raphis (ˈreɪfɪs)

noun plural raphides (ˈræfɪˌdiːz)
  1. any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
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Word Origin for raphide

C18: from French, from Greek rhaphis needle
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

raphide in Science

raphide

[rāfīd]
Plural raphides (răfĭ-dēz′)
  1. One of a bundle of needlelike crystals of calcium oxalate occurring in many plant cells. The crystals discourage animals from eating the plant by irritating their tissues.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.