/ (ˈreɪfaɪd) /
Save This Word!
noun plural raphides (ˈræfɪˌdiːz)
any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
DO A DOUBLE TAKE ON THIS QUIZ ON CONTRONYMS
Look both ways before you take this quiz on contronyms, or words that can have opposite meanings.
Question 1 of 7
Choose the sentence that uses "rent" correctly.
Word Origin for raphide
C18: from French, from Greek rhaphis needle
Words nearby raphide
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
Scientific definitions for raphide
[ rā′fīd ]
Plural raphides (răf′ĭ-dēz′)
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.