submarine
1. sub.ma.rine \'s*b-m*-.re-n, .s*b-m*-'\ aj : being, acting, or growing under water esp. in the sea {~ plants } 2. submarine n : something (as an explosive mine) that functions or operates underwater; specif : a warship designed for undersea operations 3. submarine vt : to make an attack upon or to sink by means of a submarine