The Collaborative International Dictionary
Rachidian
Rachidian \Ra*chid"i*an\ (r[.a]*k[i^]d"[i^]*an), a. [See Rachis.] (Anat. & Zo["o]l.) Of or pertaining to the rachis; spinal; vertebral. Same as Rhachidian.
Wiktionary
rachidian
a. (context anatomy zoology English) Of or relating to the rachis; spinal; vertebral.