Webster's English Dictionary

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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