am·bu·la·cral /ˌæmbjəˈlækrəl, ˈle-/
Am·bu·la·cral a. Zool. Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms.
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ambulacral
adj : pertaining to the ambulacra of radial echinoderms