a Belonging to the sex which produces sperm, which in humans and many other species is the one which has XYchromosomes. (defdate|from 14th c.)
a Pertaining to or associated with men, or male animals (defdate|from 16th c.)
a (biology) Inherently characteristic of the male of a species (defdate|from 17th c.)
a (figuratively) Of instruments or tools: designed to fit into or penetrate a "female" counterpart, as in a connector or pipe fitting (defdate|from 16th c.)