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English definition of “beam”

beam

noun [C] (LINE)    /biːm/
B2 a line of light that shines from a bright object : We could just pick out the path in the weak beam of the flashlight . The rabbit stopped , mesmerized by the beam of the car's headlights . → See also moonbeam, sunbeamQuantities and units of light a line of radiation or particles flowing in one direction : a laser beam an electron beamLightAtoms, molecules and sub-atomic particles
(Definition of beam noun (LINE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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