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ray (in physics)

ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied to streams of particles such as the electrons emitted from a cathode or particles emitted by substances exhibiting radioactivity. See cosmic rays; X ray.

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ray

ray1 line of light XIV (various techn. senses from XVII). — (O)F. rai :- L. radius; see RADIUS.

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"ray." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 27 Jun. 2017 <http://www.encyclopedia.com>.

"ray." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (June 27, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ray-1

"ray." The Concise Oxford Dictionary of English Etymology. . Retrieved June 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ray-1

ray

ray
1. (in optics) A narrow beam of radiation.

2. (in botany) See medullary ray.

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"ray." A Dictionary of Biology. . Encyclopedia.com. 27 Jun. 2017 <http://www.encyclopedia.com>.

"ray." A Dictionary of Biology. . Encyclopedia.com. (June 27, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ray-1

"ray." A Dictionary of Biology. . Retrieved June 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ray-1