ambulacral

adjective

am·​bu·​la·​cral ˌam-byə-ˈla-krəl  -ˈlā- 

: of, relating to, or being any of the radial areas of echinoderms along which run the principal nerves, blood vessels, and elements of the water-vascular system

ambulacral grooves

Word History

Etymology

ambulacrum + -all entry 1

First Known Use

1811, in the meaning defined above