rachis.
The spinal column, or the vertebrae of the spine.
Meaning & usage
The spinal column, or the vertebrae of the spine.
An anatomical shaft or axis in a marine invertebrate.
The central shaft of a feather.
The axis of either a compound leaf, inflorescence, or fern frond.
Where this word comes from
From New Latin rhachis/rachis, from Ancient Greek ῥάχις (rhákhis, “spine, ridge”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.