de·​frost·​er | \ di-ˈfrȯ-stər How to pronounce defroster (audio) , 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

First Known Use of defroster

1903, in the meaning defined above

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The first known use of defroster was in 1903

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Cite this Entry

“Defroster.” Dictionary, Merriam-Webster, Accessed 6 May. 2021.

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English Language Learners Definition of defroster

US : a device that uses heat or hot air to melt ice on or remove moisture from a surface

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