monotreme
adjective
1. (palynology, of a pollen grain) Having a single trema, or aperture.
noun
1. the most primitive mammals comprising the only extant members of the subclass Prototheria
Definition categories: animal, prototherian
1. (palynology, of a pollen grain) Having a single trema, or aperture.
1. the most primitive mammals comprising the only extant members of the subclass Prototheria
Definition categories: animal, prototherian