‖n.; pl.Hyporhachides [ NL., fr. Gr. "ypo` beneath + &unr_; spine.] (Zool.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.] [1913 Webster]
‖n.; pl. E. Rhachises L. Rhachides [ See Rachis. ] [ Written also rechis. ]1. (Anat.) The spine. [ 1913 Webster ]
2. (Bot.) (a) The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern. (b) The principal axis in a raceme, spike, panicle, or corymb. [ 1913 Webster ]
3. (Zool.) (a) The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis. (b) The central cord in the stem of a crinoid. (c) The median part of the radula of a mollusk. (d) A central cord of the ovary of nematodes. [ 1913 Webster ]
(n) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis, Syn.rachischisis, schistorrhachis
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