- acicular crystals, usually composed of calcium oxalate, that occur in bundles in the cells of many plants.
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
- 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
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
- 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.