Meaning of “ray” in the English Dictionary

"ray" in British English

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uk /reɪ/ us /reɪ/

ray noun (BEAM)

B2 [ C ] 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.
catch some/a few rays informal

to stay outside in the sun for a period of time:

I'm going out to catch a few rays before lunch.

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(Definition of “ray” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ray" in American English

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raynoun [ C ]

us /reɪ/

ray noun [ C ] (BEAM)

physics a narrow beam of light, heat, or energy

ray noun [ C ] (LINE)

geometry half of a line

ray noun [ C ] (AMOUNT)

a slight amount or signal of something good:

One couple seems interested in buying our house, which is a ray of hope after all these months.

(Definition of “ray” from the Cambridge Academic Content Dictionary © Cambridge University Press)