See also: monotrème
- Hyphenation: mo‧no‧treme
monotreme (plural monotremes)
- (zoology) a mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group
monotreme (not comparable)
- (palynology, of a pollen grain) Having a single trema, or aperture.