ambulacrum


noun, plural am·bu·lac·ra [am-byuhlak-ruh, –ley-kruh] /ˌæm byəˈlæk rə, -ˈleɪ krə/.

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

noun plural -ra (-rə)

  1. 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

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