sealed-beam

adjective
\ ˈsēl(d)-ˈbēm How to pronounce sealed-beam (audio) \

Definition of sealed-beam

: being an electric lamp with a prefocused reflector and lens sealed in the lamp vacuum

First Known Use of sealed-beam

1939, in the meaning defined above

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Time Traveler for sealed-beam

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The first known use of sealed-beam was in 1939

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Dictionary Entries Near sealed-beam

sealed bank bill

sealed-beam

sealed book

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Cite this Entry

“Sealed-beam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealed-beam. Accessed 22 Sep. 2021.

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