"Rachidial" is an adjective that refers to "related to the spine or backbone." There are several synonyms for this word that can be used to describe the same thing. These include "vertebral," "spinal," "dorsal," "backbone," and "spinal column." All of these words can be used interchangeably with "rachidial" to describe the anatomical structure that forms the central axis of the human body. When discussing medical conditions or injuries related to the spine, it is important to use the correct terminology, which includes these various synonyms for "rachidial".