ambulacrum

[am-byuh-lak-ruhm, -ley-kruhm]

noun

plural

ambulacra 

1. one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.

ambulacrum

/ ˌæmbjʊˈleɪkrəm /

noun

1. 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

Other Word Forms

• ambulacral adjective
• interambulacrum noun

Word History and Origins

Origin of ambulacrum¹

1830–40; < New Latin, Latin: alley, walking place, equivalent to ambulā- (stem of ambulāre to walk) + -crum noun suffix denoting means

Word History and Origins

Origin of ambulacrum¹

C19: from Latin: avenue, from ambulāre to walk

Example Sentences

Next to the ambulacra; as, the adambulacral ossicles of the starfish.

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In the Synaptæ, as in all the Holothurians, the madreporic body is placed near the mouth, between two of the ambulacra, and opposite the fifth or odd one.

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Spencer to have had in its ambulacra an inner as well as an outer series of plates.

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For this reason these narrower zones are called the ambulacra, while the broader zones intervening between them and supporting the spines are called the interambulacra.

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Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms.

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