Usually means: Self-contained, integrated lamp unit.
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We found 8 dictionaries that define the word sealed beam:

General (7 matching dictionaries)
  1. sealed-beam: Merriam-Webster
  2. sealed-beam: Oxford Learner's Dictionaries
  3. sealed-beam, sealed-beam: Collins English Dictionary
  4. sealed beam: Wiktionary
  5. sealed beam: Dictionary.com
  6. Sealed beam: Wikipedia, the Free Encyclopedia
  7. sealed-beam: TheFreeDictionary.com

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

Definitions from Wiktionary (sealed beam)

noun:  (technology) A type of electric lamp for producing a beam of light in which the filament is sealed inside a unit consisting of the reflector and lens so as to ensure the alignment of the beam and to protect the reflector from becoming dirty or tarnished.

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