1. a. Of, relating to, or designating the sex that has organs to produce spermatozoa for fertilizing ova. b. Characteristic of or appropriate to this sex; masculine. c. Consisting of members of this sex. 2. Virile; manly. 3. Botany a. Relating to or designating organs, such as anthers or antheridia, that produce gametes capable of fertilizing those produced by female organs. b. Bearing stamens but not pistils; staminate: male flowers. 4. Designating an object, such as an electric plug, configured for insertion into a recessed part or socket.