01 n. The spine.
pl.
Rhachises, Rhachides ((#))
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1.
The spine.(Anat.)
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2.
The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.(Bot.)
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3.
The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.(Zool.)