Definition of ambulacrum in English:

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Pronunciation: /ˌambyəˈlakrəm/ Pronunciation: /-ˈlākrəm/

noun (plural ambulacra /-ˈlakrə/ /-ˈlākrə/)

(In a starfish or other echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude.
Example sentences
  • Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect.
  • It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum.
  • Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra.



Pronunciation: /-rəl/
Example sentences
  • The ambulacral grooves are narrow and the ambulacral ossicles are not exposed.
  • In asteroids, the ambulacrals arch to form a deep ambulacral groove.
  • Its wide ambulacral grooves and open filtration fan made it adapted for motile particle capture in a wide variety of environments.


Early 19th century: Latin, 'avenue', from ambulare 'to walk'.

For editors and proofreaders

Syllabification: am·bu·lac·rum

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