rhachis (plural rhachises or rhachides)
Alternative spelling of rachis
Source: Wiktionary
Rha"chis, n.; pl. E. Rhachises, L. Rhachides. Etym: [See Rachis.] [Written also rechis.]
1. (Anat.)
Definition: 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. (Zoöl.) (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.
Source: Webster’s Unabridged Dictionary 1913 Edition
2 May 2025
(noun) excavation consisting of a vertical or sloping passageway for finding or mining ore or for ventilating a mine
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