Meaning of ambulacrum

am•bu•lac•rum

Pronunciation: (am"byu-lak'rum, -lā'krum), [key]
— pl. -lac•ra
  1. one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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