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Rhachis

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Definitions of Rhachis

Pronunciation : Rha"chis, n.; pl. E. Rhachises
Part of Speech : L.
Etymology : [See Rachis.] [Written also rechis.]
Definition : 1. (Anat.)

Defn: 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?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.

Rhachides.
Source : Webster's Unabridged Dictionary, 1913

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