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one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
Historical Examples

The ambulacral zones are depressed, leaving prominent elevations which make a very conspicuous figure on the top.
The Sea-beach at Ebb-tide Augusta Foote Arnold

ambulacral zones: The five areas containing the rows of tube-feet.
The Sea-beach at Ebb-tide Augusta Foote Arnold

Interambulacral areas: The five areas between the ambulacral zones.
The Sea-beach at Ebb-tide Augusta Foote Arnold

ambulacral grooves follow the center of all the arms and branches.
The Sea-beach at Ebb-tide Augusta Foote Arnold

In this family the ambulacral plates have but three pairs of pores.
The Sea-beach at Ebb-tide Augusta Foote Arnold

In both cases also we find the ocular spots at the tips of the ambulacral areas.
Elementary Zoology, Second Edition Vernon L. Kellogg

In this family the ambulacral plates have several pairs of pores.
The Sea-beach at Ebb-tide Augusta Foote Arnold

The same observations apply to smaller segments, and even to single detached rows of ambulacral feet.
Jellyfish, Starfish, and Sea-Urchins: Being a Research on Primitive Nervous Systems G. J. Romanes

The ambulacral zones, in five petal-like lines, form a distinct figure on the upper surface.
The Sea-beach at Ebb-tide Augusta Foote Arnold

ambulacral appendages take the form of: circumoral tentacles, sucking-feet, papillae; of these alone is always present.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 Various

noun (pl) -ra (-rə)
any of five radial bands on the ventral surface of echinoderms, such as the starfish and sea urchin, on which the tube feet are situated