Definition of mossie:
(n) :
(UK, Australia, New Zealand, colloquial) A mosquito.
(n) :
(South Africa) Any of various species of sparrow, especially Passer melanurus.
(n) :
(New Zealand, Australia, slang) A person of Maori descent living in Australia.
(n) :
(Ireland) A diminutive of the male given name Maurice.
(n) :
(dated or historical, UK, military, informal, colloquial) A de Havilland Mosquito.