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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radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.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 ?
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.
Thus, it became a veritable "mine" for the construction of the new architectonic complex, clear proof of which we find in the "refuse tip" containing spolia recovered a mere couple of years ago at the former army quarters of Saint Raphael (Torreras 2009; Fuertes, Rodero & Ariza, 2007), located halfway between both buildings and including several seamed voussoirs from the vault of the ambulacrum, as well as some pieces carved in grey micritic limestone with a very peculiar physiognomy, and perhaps formerly part of the enclosed seats of honour of the proedia (Murillo et al, 2010a, 262-284, fig.
De estos espacios, el mas intensamente museizado es el del foro donde, entre otras actuaciones, se ha reconstruido una parte del ambulacrum (Aquilue y Tremoleda 2011).
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).