Definition from Wiktionary, the free dictionary
- (botany) The main shaft of either a compound leaf, head of grain, or fern frond.
- (zoology, anatomy) The spine or the vertebrae of the spine.
- (ornithology) The central shaft of a feather.
- The plural form rachides is technically erroneous, being based on a mistaken impression of the Ancient Greek stem.
main shaft of a compound leaf or head of grain