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rhachis
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- Rhachis - n. - The spine.
- Rhachis - n. - The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.
- Rhachis - n. - The principal axis in a raceme, spike, panicle, or corymb.
- Rhachis - n. - The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.
- Rhachis - n. - The central cord in the stem of a crinoid.
- Rhachis - n. - The median part of the radula of a mollusk.
- Rhachis - n. - A central cord of the ovary of nematodes.
- Rhachises - pl. - of Rhachis
- Virgularian - n. - Any one of numerous species of long, slender Alcyonaria belonging to Virgularia and allied genera of the family Virgularidae. These corals are allied to the sea-pens, but have a long rodlike rhachis inclosing a slender, round or square, calcareous axis. The polyps are arranged in transverse rows or clusters along each side of the rhachis.
- Rhachis - n. - The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.
- Vexillum - n. - The rhachis and web of a feather taken together; the vane.
- Vane - n. - The rhachis and web of a feather taken together.