noun
a mammal of the order Monotremata, which includes the platypus and echidnas, that lay eggs instead of giving birth to live young
-
The monotreme is a unique type of mammal that lays eggs instead of giving birth to live young.
-
Did you know that the platypus is a type of monotreme?
-
That monotreme is one weird animal, laying eggs and all.
-
Being a monotreme in a world of mammals can sometimes make you feel like the odd one out.