|rü(ˌ)brō+ adjective
Etymology: rubro- (from Latin rubr-, ruber red + English -o- ) + spinal — more at red
1. : of, relating to, or connecting the red nucleus and the spinal cord
2. : of, relating to, or constituting a tract of crossed nerve fibers passing from the red nucleus and the spinal cord and relaying impulses from the cerebellum and corpora striata to the motor neurons of the cord