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noun Rhachis n. (pl. E. rhachises, L. rhachides) (Written also rechis) 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.(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.
Collaborative International Dictionary of English 0.48
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