submarine
adj.
1640s, from sub- + marine, adj..
n.
"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.
〔李〕[sub-=under在…之下；marine n.船舶 →] n.a boat that can go under water潜水艇
〔李〕[sub-;mar;-inea.] a.水下的，水底的 n.潜水艇 ←mar (L mare,maris)=sea 海
〔蒋〕[sub-在…下面，mar海，ine形容词后缀，…的] 海面下的，海底的，[转为名词;’潜入海面下之物”] 潜水艇