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

Word History

First Known Use

1939, in the meaning defined above

Time Traveler
The first known use of sealed-beam was in 1939

Dictionary Entries Near sealed-beam

Cite this Entry

“Sealed-beam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealed-beam. Accessed 26 Nov. 2022.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!


Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ