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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radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.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.


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


(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.
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
References in periodicals archive ?
Entries on individual genera include identifying features, the apical system, ambulacra, interambulacra, peristome, spines, color, and distribution.
The water vascular system of this species is comprised of a circular canal as well as 5 radial canals, canals to the ambulacra, oral tentacles with their ampullae, a stone canal, and a madreporite (Fig.
This system labels ambulacra with Roman numerals and interambulacra with Arabic numerals, proceeding counterclockwise.
Architecture of the paired anterior ambulacra (II and IV).
Apart from the body wall with five ambulacra, only the mesentery is present in the anterior region after evisceration.