pl. ra′chises or ra·chi·des
- spinal column
- Bot. the principal axis of an inflorescence or of a compound leaf
- Zool. the shaft of a feather, esp. that part bearing the barbs
Origin of rachisModern Latin ; from Classical Greek rhachis, backbone ; from Indo-European base an unverified form wr??h-, thorn, point from source Lithuanian rãžas, stubble
nounpl. ra·chis·es or rach·i·des
- a. The main stem of an elongated inflorescence, as in a grass.b. The main axis of a pinnately compound leaf or of a fern frond.
- The main shaft of a bird's feather, especially the part to which the barbs are attached.
- The spinal column.
Origin of rachisNew Latin, from Greek rhakhis, spine, ridge.
(plural rachises or rachides)
- The plural form rachides is technically erroneous, being based on a mistaken impression of the Ancient Greek stem.
From New Latin, from Ancient Greek á¿¥Î¬Ï‡Î¹Ï‚ (rhakhis, “spine, ridge").