- (n.) The principal axis in a raceme, spike, panicle or corymb.
- (n.) The shaft of a feather. The rhachis of the after-shaft or plumule, is called the hyporhachis.
- (n.) The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.
- (n.) A central cord of the ovary of nematodes.
- (n.) The median part of the radula of a mollusk.
- (n.) The spine.
- (n.) The central cord in the stem of a crinoid.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Rhachis. Retrieved September 20, 2026, from http://smartdefine.org/rhachis/definitions/2055689 |
| Chicago | Webster's. 2011. "Rhachis" http://smartdefine.org/rhachis/definitions/2055689 (accessed September 20, 2026). |
| Harvard | Webster's 2011, Rhachis, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/rhachis/definitions/2055689>. |
| MLA | Webster's. "Rhachis" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/rhachis/definitions/2055689> |