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sealed-beam headlight

[seeld-beem]
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noun
  1. a headlight in which the reflector and lens are hermetically sealed together with the filament in a single unit.
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Also called sealed beam.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sealed-beam

sealed-beam

adjective
  1. (esp of a car headlight) having a lens and prefocused reflector sealed in the lamp vacuum
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012