Definition of ambulacrum in English:


Syllabification: am·bu·lac·rum
Pronunciation: /ˌambyəˈlakrəm, -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.
    More 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.



More 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'.

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Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space