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WordReference Random House Unabridged Dictionary of American English © 2024am•bu•lac•rum (am′byə lak′rəm, -lā′krəm),USA pronunciation n., pl. -lac•ra (-lak′rə, -lā′krə).USA pronunciation - Invertebratesone of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
- Neo-Latin, Latin: alley, walking place, equivalent. to ambulā- (stem of ambulāre to walk) + -crum noun, nominal suffix denoting means
- 1830–40
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