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n. pl. am·bu·lac·ra (-lăk′rə, -lā′krə)
One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.
[Latin ambulācrum, walk planted with trees, from ambulāre, to walk; see ambhi in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -ra (-rə)
(Zoology) 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
[C19: from Latin: avenue, from ambulāre to walk]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
am•bu•lac•rum(ˌæm byəˈlæk rəm, -ˈleɪ krəm)
n., pl. -lac•ra (-ˈlæk rə, -ˈleɪ krə)
one of the radiating surface areas in echinoderms, through which the tube feet protrude during movement.
[1830–40; < New Latin, Latin: alley, walking place =ambulā(re) to walk (see amble) + -crum n. suffix denoting means]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||ambulacrum - one of the five areas on the undersurface of an echinoderm on which the tube feet are located|
echinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies
body part - any part of an organism such as an organ or extremity
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