— ambulacral , adj.
/am'byeuh lak"reuhm, -lay"kreuhm/ , n. , pl. ambulacra /-lak"reuh, -lay"kreuh/ .
one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
[ 1830-40; ambula- (s. of ambulare to walk) + -crum n. suffix denoting means ]