ambulacral

adjective
am·​bu·​la·​cral | \ˌam-byə-ˈla-krəl, -ˈlā- \

Definition of ambulacral 

: 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

First Known Use of ambulacral

1811, in the meaning defined above

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The first known use of ambulacral was in 1811

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