raphide

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raphide

(rā′fīd) also

raphis

(-fĭs)
n. pl. raphides (răf′ĭ-dēz′) or raphises
One of a bundle of needlelike crystals of calcium oxalate occurring in many plant cells.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

raphide

a calcium oxalate crystal present in bundles in some plant cells.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005