adj

• (grammar, less common than 'masculine') Masculine; of the masculine grammatical gender.
  "The teacher's voice inflects the pulse of nêhiyawêwin as he teaches us. He says a prayer in the first class. Nouns, we learn, have a gender. In French, nouns are male or female, but in Cree, nouns are living or non-living, animate or inanimate."
• (of bacteria) Having the F factor; able to impart DNA into another bacterium which does not have the F factor (a female).
  "Furthermore, male bacteria with fi + R factors, which inhibit the function of F (fi fertility inhibition) (Watanabe et al., 1964a), cannot form specific cell pairs at high frequencies. On the contrary, the formation of[…]"
• (figuratively) Of instruments, tools, or connectors: designed to fit into or penetrate a female counterpart, as in a connector, pipe fitting or laboratory glassware.
  "Male adapter connects female pipe threads to polyethylene cold-water pipe; [...] female flare coupling connects male pipe threads to flared copper or plastic;"