antifog
adjective
an·ti·fog ˌan-ˌtē-ˈfȯg 
ˌan-tī-
variants or antifogging
ˌan-ˌtē-ˈfȯ-giŋ
ˌan-tī-
: preventing or inhibiting the buildup of condensation on a surface (such as a lens or window)
lenses with an antifog coating
an antifogging surface
Word History
Etymology
anti- + fog entry 1 or fogging, present participle of fog entry 2
First Known Use
1919, in the meaning defined above