Hypertext Webster Gateway: "rhachis"

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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