defroster
noun
de·frost·er
| \ di-ˈfrȯ-stər
, ˈdē-ˌfrȯ-\
, ˈdē-ˌfrȯ-\
plural defrosters
Definition of defroster
: a person or thing that defrosts something
She was a cook. I was an opener of cans, a defroster of TV dinners.— Bernie Schiffer
especially
: a device or system designed to heat a window or windshield of a vehicle for the purpose of removing accumulated ice or moisture
The rear window defroster worked well in the center, but it needs more grid lines for full coverage. — Consumer Reports Their breath fogged the windshield immediately, and Gus slowed to a crawl on the winding street, reaching down to adjust the wipers and the defroster. — Frank Conroy