blowhole
blow.hole \-.ho-l\ n 1: a nostril in the top of the head of a whale or other cetacean 2: a hole in the ice to which aquatic mammals (as seals) come to breathe
Webster's English Dictionaryblow.hole \-.ho-l\ n 1: a nostril in the top of the head of a whale or other cetacean 2: a hole in the ice to which aquatic mammals (as seals) come to breathe