defog
verb
de·fog (ˌ)dē-ˈfȯg 
-ˈfäg
defogged; defogging; defogs
transitive verb
: to remove fog or condensed moisture from
defog a windshield
defogger noun
Example Sentences
Recent Examples on the Web Just hover a finger close to the mirror’s control panel or use the app to turn the fixture on, adjust the brightness or defog the glass after a steamy shower. 
Matthew Kronsberg, WSJ, 21 Jan. 2022 Zeroing in on how the virus invades and affects the brain has the potential to defog the window into long Covid, an illness that doctors so far have been unable to appropriately define, diagnose or treat. NBC News, 4 Nov. 2021 At this point the touchscreen dies, taking with it functions like the car's backup camera, the ability to defog the windows, and also the audible alerts and chimes for the driver aids and turn signals. Jonathan M. Gitlin, Ars Technica, 17 Nov. 2020 The manual includes step-by-step instructions and photos for how to make the masks, but also how to clean them and defog them. Evan Casey, Milwaukee Journal Sentinel, 1 May 2020
Matthew Kronsberg, WSJ, 21 Jan. 2022 Zeroing in on how the virus invades and affects the brain has the potential to defog the window into long Covid, an illness that doctors so far have been unable to appropriately define, diagnose or treat. NBC News, 4 Nov. 2021 At this point the touchscreen dies, taking with it functions like the car's backup camera, the ability to defog the windows, and also the audible alerts and chimes for the driver aids and turn signals. Jonathan M. Gitlin, Ars Technica, 17 Nov. 2020 The manual includes step-by-step instructions and photos for how to make the masks, but also how to clean them and defog them. Evan Casey, Milwaukee Journal Sentinel, 1 May 2020 Word History
First Known Use
1904, in the meaning defined above