Raphides n. pl. : See Rhaphides.

Example:
Why do pineapple cells have clusters of tiny needle-shaped calcium oxalate crystals known as Raphides?

Taxonomy
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Defination from the web:
Raphides in the Online Dictionary. Meaning of Raphides. Pronunciation of Raphides. Translations of Raphides. Raphides synonyms, Raphides antonyms. ... Raphides. Raphidiidae. Raphidiodea. Raphidioptera. Raphidocelis. Raphidophyte. Raphinae. Raphine, VA. Raphine, Virginia ...