DEUTEROSTOME

[deu.tero.stome] n [NL Deuterostomia, group name, fr. deuter- + Gk stoma mouth--more at stomach] (1950): any of a major division (Deuterostomia) of the animal kingdom that includes the bilaterally symmetrical animals (as the chordates) with indeterminate cleavage and a mouth that does not arise from the blastopore