'Rachises' definitions:

Definition of 'Rachises'

From: GCIDE

Rachis \Ra"chis\ (r[=a]"k[i^]s), n.; pl. E. Rachises (r[=a]"k[i^]s*[e^]z), L. Rachides (r[a^]k"[i^]*d[=e]z). [NL., fr. Gr. "ra`chis, -ios.] [Written also rhachis.]
1. (Anat.) The spine; the vertebral column. [1913 Webster]
2. (Bot. & Zool.) Same as Rhachis. [1913 Webster]