submarine (adj.)youdaoicibaDictYouDict[submarine 词源字典]
1640s, from sub- + marine (adj.).[submarine etymology, submarine origin, 英语词源]
submarine (n.)youdaoicibaDictYouDict
"submarine boat," 1899, from submarine (adj.). Earlier "a creature living under the sea" (1703). The short form sub is first recorded 1917. As a type of sandwich from 1955, so called from the shape of the roll. Related: Submariner.