ev·a·nesce 
(ĕv′ə-nĕs)
(ĕv′ə-nĕs)intr.v. ev·a·nesced, ev·a·nesc·ing, ev·a·nesc·es
To dissipate or disappear like vapor. See Synonyms at disappear.
[Latin ēvānēscere, to vanish : ē-, ex-, ex- + vānēscere, to disappear (from vānus, empty; see euə- in the Appendix of Indo-European roots).]
ev′a·nescence n.