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rhachis |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Rhachis \Rha"chis\, n.; pl E. {Rhachises}, L. {Rhachides}. [See {Rachis}.] [Written also {rechis}.] 1. (Anat.) The spine. 2. (Bot.) a The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern. b The principal axis in a raceme, spike, panicle, or corymb. 3. (Zo["o]l.) a The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis. b The central cord in the stem of a crinoid. c The median part of the radula of a mollusk. d A central cord of the ovary of nematodes. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Rachis \Ra"chis\, n.; pl E. {Rachises}, L. {Rachides}. [NL., fr Gr ? ?.] [Written also {rhachis}.] 1. (Anat.) The spine; the vertebral column. 2. (Bot. & Zo["o]l.) Same as {Rhachis}.
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