adjective

1. designating or of the sex that fertilizes the ovum of the female and begets offspring: biological symbol, ♂
2. of, characteristic of, or suitable for members of this sex; masculine; virile
3. consisting of men or boys
4. designating or having a part shaped to fit into a corresponding hollow part (called female): said of pipe fittings, electric plugs, etc.
5. Bot.
   1. having stamens or antheridia and no carpels, archegonia, or oogonia
   2. designating or of a reproductive structure or part producing spermatozoids that can fertilize the female eggs

Etymology: ME < OFr male, masle < L masculus < mas (gen. maris), a male, man

noun

1. a male person; man or boy
2. a male animal or plant