Dictionaryam•bu•lac•rumPronunciation: (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.
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