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- Noun

The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.

- Noun

The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.

- Noun

The principal axis in a raceme, spike, panicle, or corymb.

- Noun

The median part of the radula of a mollusk.

- Noun

The central cord in the stem of a crinoid.

- Noun

A central cord of the ovary of nematodes.

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