monotrematous

[mon-uh-trem-uh-tuh s, -tree-muh-]

adjective

of or relating to a monotreme.

Origin of monotrematous

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