ambulacrum

American  

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

noun

ambulacra plural

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

---

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

---

Other Word Forms

Derived Forms

• interambulacrum
  noun
• ambulacral
  adjective

Inflected Forms

Nouns

• ambulacra
  plural

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

See Examples For:

ambulacra

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 Seaside Studies in Natural History Marine Animals of Massachusetts Bay. Radiates. by Agassiz, Alexander

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 The Atlantic Monthly, Volume 10, No. 57, July, 1862 by Various

The fourth class of Pelmatozoa—the Edrioasteroidea—differs from the others in the structure of its ambulacra.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various

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

From Webster's Unabridged Dictionary by Webster, Noah

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

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various