SG Heritage Dictionary

Word of the Day: Catachrestical

Rhachis [Noun] Webster's Dictionary 1913

1. The spine.

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

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

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

5. The central cord in the stem of a crinoid.

6. The median part of the radula of a mollusk.

7. A central cord of the ovary of nematodes.

Rhachises [Plural] Webster's Dictionary 1913