rap-hide

raphides

[raf-i-deez]
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.

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

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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.
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