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

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

noun plural raphides (ˈræfɪˌdiːz)

  1. any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product

Plural raphides (răfĭ-dēz′)

  1. 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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