ambulacrum

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

noun

, plural am·bu·lac·ra [am-by, uh, -, lak, -r, uh, -, ley, -kr, uh].

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

Derived Forms

• ˌambuˈlacral, adjective

Other Words From

• ambu·lacral adjective
• inter·ambu·lacrum noun plural interambulacra

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.

From Project Gutenberg

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.

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

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

From Project Gutenberg