plural noun, singular raphide [rey-fahyd] , raphis [rey-fis] . Botany.
acicular crystals, usually composed of calcium oxalate, that occur in bundles in the cells of many plants.

1835–45; < Neo-Latin < Greek rhaphídes, plural of rhaphís needle

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To raphis
World English Dictionary
raphide or raphis (ˈreɪfaɪd, ˈreɪfɪs)
n , pl raphides
any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
[C18: from French, from Greek rhaphis needle]
raphis or raphis (ˈreɪfaɪd, ˈreɪfɪs, ˈræfɪˌdiːz)
[C18: from French, from Greek rhaphis needle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
raphide   (rā'fīd)  Pronunciation Key 
Plural raphides (rāf'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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature