| Title | photon |
|---|---|
| Text |
Merriam-Webster's Collegiate Dictionary pho·ton \\ˈfō-ˌtän\\ noun ETYMOLOGY phot- + -on (II) DATE 1916 1. a unit of intensity of light at the retina equal to the illumination received per square millimeter of a pupillary area from a surface having a brightness of one candle per square meter 2. a quantum of electromagnetic radiation • pho·ton·ic \\fō-ˈtä-nik\\ adjective English Etymology photon "unit of electromagnetic radiation," 1926, from photo- "light" + on"unit." Oxford Advanced Learner's Dictionary-牛津双解-OALD7 photon pho·ton / 5fEutCn; NAmE 5foutB:n / noun (physics 物) a unit of electromagnetic energy 光子；光量子 Webster's Third New International Dictionary, Unabridged Search result show the entry is found in: single photon emission computed tomography pho·ton \ˈfōˌtän\ noun (-s) Etymology: phot- + -on 1. : a massless elementary particle with one quantum unit of spin that is the carrier of radiant energy (as light or X rays) 2. : a unit of intensity of light at the retina equal to the illumination received per square millimeter of a pupillary area from a surface having a brightness of one candle per square meter — called also troland |
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