ambulacrum

American  

[am-byuh-lak-ruhm, -ley-kruhm] / ˌæm byəˈlæk rəm, -ˈleɪ krəm /

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.

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ambulacrum British  

/ 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

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Other Word Forms

• ambulacral adjective
• interambulacrum noun

Etymology

Origin of ambulacrum

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

Example Sentences

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

From Project Gutenberg

These suckers are called the ambulacra, the lines along which they run are called the ambulacral rows or zones, while the system of locomotion as a whole is known as the ambulacral system.

From Project Gutenberg

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

From Project Gutenberg

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.

From Project Gutenberg

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

From Project Gutenberg