Definition of raphide in English:

raphide

noun

Botany
  • A needle-shaped crystal of calcium oxalate occurring in clusters within the tissues of certain plants.

    • ‘The callus consists largely of parenchyma with raphides and is supplied by eight to ten collateral bundles.’
    • ‘Occasionally, calcium oxalate raphide or druse crystals were observed in this tissue.’
    • ‘The raphides project into the anther locule.’
    • ‘In monocots, calcium oxalate is most often laid down and usually as bundles of needle-shaped crystals known as raphides.’
    • ‘Some of the latter are idioblastic and enclose raphides, whereas others are larger and form cavities containing mucilage.’

Origin

Mid 19th century: via French from Greek rhaphis, rhaphid- needle.

Pronunciation:

raphide

/ˈrāfīd/