单词：rhachis
n. The continued stem or midrib of a pinnately compound leaf,
as in a rose leaf or a fern.
n. The principal axis in a raceme, spike, panicle, or corymb.
n. The shaft of a feather. The rhachis of the after-shaft, or
plumule, is called the hyporhachis.
n. The central cord in the stem of a crinoid.
n. The median part of the radula of a mollusk.
n. A central cord of the ovary of nematodes.
- rachis脊椎
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