demisting

/D AH0 M IH1 S T IH0 NG/
verb
  1. 1

    To remove the layer of fine liquid particles from the surface of (a window or mirror).

noun
  1. 1

    The removal of the layer of fine liquid particles from the surface of a window or mirror.

Source: https://en.wiktionary.org/wiki/demist, https://en.wiktionary.org/wiki/demisting