2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Rhachis \Rha"chis\, n.; pl. E. {Rhachises}, L. {Rhachides}. [See {Rachis}.] [Written also {rechis}.] 1. (Anat.) The spine. [1913 Webster] 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. [1913 Webster] 3. (Zool.) (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. [1913 Webster] From WordNet (r) 2.0 [wn]: rhachides See {rhachis}
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