Medical Definition of mating type
: a strain or clone or other isolate made up of organisms (as certain fungi or protozoans) incapable of sexual reproduction with one another but capable of such reproduction with members of other strains of the same organism and often capable of behaving as male in respect to one strain and as female in respect to another—see minus, plus
Seen and Heard
What made you want to look up mating type? Please tell us where you read or heard it (including the quote, if possible).