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[am-byuh-lak-ruh m, -ley-kruh m] /ˌæm byəˈlæk rəm, -ˈleɪ krəm/
noun, plural ambulacra
[am-byuh-lak-ruh, -ley-kruh] /ˌæm byəˈlæk rə, -ˈleɪ krə/ (Show IPA)
one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
Origin of ambulacrum
1830-40; < New Latin, Latin: alley, walking place, equivalent to ambulā- (stem of ambulāre to walk) + -crum noun suffix denoting means
Related forms
ambulacral, adjective
interambulacrum, noun, plural interambulacra. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ambulacrum


noun (pl) -ra (-rə)
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
Derived Forms
ambulacral, adjective
Word Origin
C19: from Latin: avenue, from ambulāre to walk
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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