plural noun, singular ra·phide [rey-fahyd] /ˈreɪ faɪd/, ra·phis [rey-fis] /ˈreɪ fɪs/. Botany.

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. 2019

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Plural raphides (răfĭ-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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