See dematerialize in American Heritage Dictionary 4
(dēˌmə-tîrˈē-ə-līzˌ)
tr. & intr.v.de·ma·te·ri·al·ized, de·ma·te·ri·al·iz·ing, de·ma·te·ri·al·iz·es
To deprive of or lose apparent physical substance; make or become immaterial: Mirrors have the effect of dematerializing a wall. The dry ice seemed to dematerialize as it sublimated.