Definitions from Wiktionary (rachis)

▸ noun:  (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine.
▸ noun:  (zoology) An anatomical shaft or axis in a marine invertebrate.
▸ noun:  (ornithology) The central shaft of a feather.
▸ noun:  (botany) The axis of either a compound leaf, inflorescence, or fern frond.
▸ Also see rachis


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