Origin: 1830–40; prob. back-formation from submersion < LL submersiōn-, s. of submersiō a sinking, equiv. to L submers(us) ptp. of submergere to submerge+ -iōn--ion
sub·merse (səb-mûrs') tr.v.
sub·mersed, sub·mers·ing, sub·mers·es To submerge.
[Probably back-formation from submersion, act of submerging, from Late Latin submersiō, submersiōn-, from Latin submersus, past participle of submergere, to submerge; see submerge.] sub·mer'sion (-mûr'zhən, -shən) n.