raphide

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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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)
 
n
 
[C18: from French, from Greek rhaphis needle]

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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.
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