(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.

(automotive, dated) A headlight setting intended for roads with traffic on them at night.

A horizontal truss joining the queen posts in rafters.

plural of beam splitter

A type of jetty that runs diagonally from one corner to another and supports the corner posts above, while being supported by corner posts below.

(physics) A beam of beta particles, electron neutrinos or of radioactive ions

(engineering) A beam with cross-section shaped like a capital letter I (with serifs top and bottom), used in construction.

present participle of beam up

simple past tense and past participle of beam up

(physics) A non-diffracting waveform that gives the appearance of curving as it travels.