Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

beam

noun [C] (LINE)
 
 
/biːm/

Definition

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)
Focus on the pronunciation of beam