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.
noun plural raphides (ˈræfɪˌdiːz)
- any of numerous needle-shaped crystals, usually of calcium oxalate, that occur in many plant cells as a metabolic product
Plural raphides (răf′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.