1. Of the male sex; not female. Thy masculine children, that is to say, thy sons. Chaucer. 2. Having the qualities of a man; suitable to, or characteristic of, a man; virile; not feminine or effeminate; strong; robust. That lady, after her husband's death, held the reins with a masculine energy. Hallam. 3. Belonging to males; appropriated to, or used by, males. [R....