sealed beam (English, noun)
expansion: sealed beam (plural sealed beams)
Senses:
topics: engineering
natural-sciences
physical-sciences
technology
glosses: 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.
Forms:
form: sealed beams
tags: plural