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English definition of “ray”

ray

noun [C] (BEAM)    /reɪ/
B2 a narrow beam of light, heat, etc. travelling in a straight line from its place of origin: A ray of sunshine shone through a gap in the clouds. Light rays bend as they pass from air to water.Quantities and units of light
(Definition of ray noun (BEAM) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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