Also found in: Medical, Encyclopedia, Wikipedia.


 (rā′fīd) also ra·phis (-fĭs)
n. pl. raph·i·des (răf′ĭ-dēz′) or ra··phis·es
One of a bundle of needlelike crystals of calcium oxalate occurring in many plant cells.

[French, sing. of raphides, from New Latin, from Greek rhaphides, pl. of rhaphis, needle, from rhaptein, to sew; see wer- in Indo-European roots.]


(ˈræf ɪˌdiz)

needle-shaped crystals, usu. composed of calcium oxalate, that occur in bundles in the cells of many plants.
[1835–45; < New Latin < Greek rhaphídes, pl. of rhaphís needle]
Mentioned in ?
References in periodicals archive ?
Some of these turtles eat large amounts of elephant-ear (Colocassia esculenta), which contains needle-like raphides of oxalic acid monohydrate in its acidic sap.
3h) indicates the occurrence of what are probably tapetal raphides, which also are known from other commelinaceous genera and several other related families (Hardy & Stevenson, 2000a, b; Hardy et al.
Idioblasts containing raphides along the leaf margin region are common (Fig.
The precise assignation of Epilobium species was based on tri-chome and raphides morphology (Krajsek et al.
Sefa-Dedeh S and SE Kofi-Agyir Starch structure and some properties of cocoyam (Xanthosoma sagittifolium and Colocasia esculenta) starch and raphides.
Each addresses a taphonomic issue with starch identification following cooking, movement of starch through sediments and the problems with the identification of raphides associated with plant use.
Bischoff describes the unique way in which the toxin in these plants works: "These plants contain pointy crystals called raphides in packets within the cells called idioblasts.
Idioblasts with raphides in the storage parenchyma and chlorenchyma.