ra·phide 
(rāfīd) also ra·phis (-fĭs)
(rāfīd) also ra·phis (-fĭs)n. pl. raph·i·des (răfĭ-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-2 in the Appendix of Indo-European roots.]