Main Entry: deu·tero·stome

Pronunciation: \ˈdü-tə-rō-ˌstōm also ˈdyü-\

Function: noun

Etymology: New Latin Deuterostomia, group name, from deuter- + Greek stoma mouth — more at stomach

Date: 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