ambulacrum

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ambulacrum

(ăm′byə-lăk′rəm, -lā′krəm)
n. pl. ambu·lacra (-lăk′rə, -lā′krə)
One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.

am′bu·lac′ral adj.

ambulacrum

one of the five radial bands on which tube feet occur on the outside surfaces of ECHINODERMS.