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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radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.ambulacral - pertaining to the ambulacra of radial echinodermsambulacral - pertaining to the ambulacra of radial echinoderms
zoological science, zoology - the branch of biology that studies animals
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.
Characters examined include general body appearance, encrusting ossicles, pedicellariae, madreporite, abactinals, terminals, marginals, intermarginals, actinals, oral frame, ambulacral grooves and interambulacrals, papulae, tube feet, digestive tract, and its development.
The dorsal surface of this species is characterized by a series of irregularly positioned papillae of different sizes and shapes (Dendy 1896, Sewell 1987), although the ventral surface is smoother, with the presence of ambulacral podia, or tube feet, which are used for locomotion (Dendy 1896, Sewell 1987).
Surco ambulacral estrecho, las placas interambulacrales tienen una hilera de espinas internas pequenas, digitiformes, varias en cada placa, y una serie externa de espinas mas grandes, dos en cada placa.
Legs: bear short, smooth and needle-like setae, leg I without ambulacral prolognation.
The monophyly of the genus Echinocardium is based on two synapomorphies: an anal branch is added to the subanal fasciole, and the labrum is short and bordered by two pairs of ambulacral plates.
Ambulacral grooves descend from the arms, run along the surface of the visceral mass, and unite at the centrally located mouth (Fig.
Legs (Figs 22-25): All legs with ambulacral claws, all setae on legs smooth.
columbiana was related to an unusual defense in which the snail inserted its proboscis deep into one of the sea star's ambulacral grooves and bit the radial nerve.