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Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms.

In the Synaptæ, as in all the Holothurians, the madreporic body is placed near the mouth, between two of the ambulacra, and opposite the fifth or odd one.

Spencer to have had in its ambulacra an inner as well as an outer series of plates.

For this reason these narrower zones are called the ambulacra, while the broader zones intervening between them and supporting the spines are called the interambulacra.

Next to the ambulacra; as, the adambulacral ossicles of the starfish.