deuterostome

noun
deu·​tero·​stome | \ˈdü-tə-rō-ˌstōm also ˈdyü- \

Definition of deuterostome 

: any of a major division (Deuterostomia) of the animal kingdom that includes the bilaterally symmetrical animals (such as the chordates) with indeterminate cleavage and a mouth that does not arise from the blastopore

First Known Use of deuterostome

1950, in the meaning defined above

History and Etymology for deuterostome

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

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The first known use of deuterostome was in 1950

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