Dictionary
am•bu•lac•rum
Pronunciation: (am"byu-lak'rum, -lā'krum), [key]—
n.,
—pl. -lac•raPronunciation: (-lak'ru, -lā'kru). [key]
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.