Mōn'o-trēme, n.
n. [Gr. μόνος, one, only, and τρῆμα, a hole.] (Zoöl.) An animal having only one external opening for the feces and urine, as the duckbill of Australia, &c. Dana.
n. [Gr. μόνος, one, only, and τρῆμα, a hole.] (Zoöl.) An animal having only one external opening for the feces and urine, as the duckbill of Australia, &c. Dana.