monotrematous

== English == === Etymology 1 === Monotremata +‎ -ous ==== Adjective ==== monotrematous (not comparable) (zoology) Of or pertaining to the Monotremata or monotremes. Synonym: monotremous === Etymology 2 === ==== Adjective ==== monotrematous (not comparable) (ichthyology) Of the olfactory organ of a fish, having a single opening from which water flows in and out.