monotrematous

[ mon-uh-trem-uh-tuhs, -tree-muh- ]

adjective

1. of or relating to a monotreme.

Word History and Origins

Origin of monotrematous¹

1825–35; < New Latin monotrematus literally, single-holed, equivalent to mono- mono- + -trematus -holed, adj. use of Greek trêma, stem trēmat- hole, perforation; -ous