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 (ăm′byə-lăk′rəm, -lā′krəm)
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radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.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.]

am′bu·lac′ral adj.
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]
ˌambuˈlacral adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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]
am`bu•lac′ral, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ambulacrum - one of the five areas on the undersurface of an echinoderm on which the tube feet are locatedambulacrum - 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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Nutritional particles are caught by ambulacral tentacles located along the entire length of the ambulacrum. Therefore, the water flow in the feeding grooves had no direct functional significance for the catching of food.
Todas ellas cuentan con un modulo y dimensiones similares; poseen, como ya se ha indicado, un criptoportico en uno de sus lados y responden a un modelo de tres naves con ambulacrum (Rascon y Sanchez, 2009: 814) como en el caso del edificio de Contributa.
Many of the curvilinear spines on the dorsal side, except those covering the anterior ambulacrum (III), gradually broaden and flatten distally (Figure 7).