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ambulacrum

[am-byuh-lak-ruh m, -ley-kruh m]
noun, plural am·bu·lac·ra [am-byuh-lak-ruh, -ley-kruh] /ˌæm byəˈlæk rə, -ˈleɪ krə/.
  1. one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
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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 formsam·bu·lac·ral, adjectivein·ter·am·bu·la·crum, noun, plural in·ter·am·bu·la·cra.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ambulacrum

ambulacrum

noun plural -ra (-rə)
  1. 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
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Derived Formsambulacral, adjective

Word Origin for ambulacrum

C19: from Latin: avenue, from ambulāre to walk
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012