‖Ra″chis (rā″kĭs), n.; pl. E. Rachises (–ĕz), L. Rachides (răk″ĭ‐dēz). [NL., fr. Gr. ρἅχισ, -ιοσ.] [Written also rhachis.] 1. (Anat.) The spine; the vertebral column.
2. (Bot. & Zoöl.) Same as Rhachis.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.