- The spine. - 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. - 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.
Definition
[ n.]