The Collaborative International Dictionary of English v.0.48:
Ambulacral \Am`bu*la"cral\, a. (Zool.) Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms. [1913 Webster]WordNet (r) 3.0 (2006):
ambulacral adj 1: pertaining to the ambulacra of radial echinoderms