Origin: See Rachis

Alternative forms: rechis.

1. <anatomy> The spine.

2. <botany> The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern. The principal axis in a raceme, spike, panicle, or corymb.

3. <zoology> The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis. The central cord in the stem of a crinoid.

The median part of the radula of a mollusk.

A central cord of the ovary of nematodes.

(01 Mar 1998)

rhachi-, rhachiglossa, rhachilla, rhachiodont < Prev | Next > rhadinovirus, rhagades, rhagadiform

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