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We found 60 dictionaries with English definitions that include the word photon:
Click on the first link on a line below to go directly to a page where "photon" is defined.

General (27 matching dictionaries)

1. photon: UltraLingua English Dictionary [home, info]
2. Photon (Image Comics), Photon (TV series), Photon (album), Photon (anime), Photon (comics), Photon (disambiguation), Photon: Wikipedia, the Free Encyclopedia [home, info]
3. photon: Rhymezone [home, info]
4. photon: Hutchinson's Dictionary of Difficult Words [home, info]
5. photon: Free Dictionary [home, info]
6. photon: Hutchinson Dictionaries [home, info]
7. photon: The Phrontistery - A Dictionary of Obscure Words [home, info]
8. photon: Mnemonic Dictionary [home, info]
9. photon: WordNet 1.7 Vocabulary Helper [home, info]
10. photon: LookWAYup Translating Dictionary/Thesaurus [home, info]
11. photon: Dictionary/thesaurus [home, info]
12. photon: Merriam-Webster.com [home, info]
13. photon: Oxford Dictionaries [home, info]
14. photon: American Heritage Dictionary of the English Language [home, info]
15. photon: Collins English Dictionary [home, info]
16. photon: Vocabulary.com [home, info]
17. photon: Macmillan Dictionary [home, info]
18. Photon, photon: Wordnik [home, info]
19. photon: Cambridge Advanced Learner's Dictionary [home, info]
20. photon: Wiktionary [home, info]
21. photon: Webster's New World College Dictionary, 4th Ed. [home, info]
22. photon: The Wordsmyth English Dictionary-Thesaurus [home, info]
23. photon: Infoplease Dictionary [home, info]
24. photon: Dictionary.com [home, info]
25. photon: Online Etymology Dictionary [home, info]

Art (1 matching dictionary)

26. photon: ArtLex Lexicon of Visual Art Terminology [home, info]

Business (1 matching dictionary)

27. photon: Legal dictionary [home, info]

Computing (2 matching dictionaries)

28. photon: Encyclopedia [home, info]
29. Photon: Windows API Guide [home, info]

Medicine (2 matching dictionaries)

30. photon: online medical dictionary [home, info]
31. photon: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

32. PHOTON: Acronym Finder [home, info]
33. PHOTON: AbbreviationZ [home, info]

Science (13 matching dictionaries)

34. Photon: From Stargazers to Starships Glossary [home, info]
35. Photon: Chemistry Dictionary [home, info]
36. Photon: Solar Radiation Resource Terms [home, info]
37. Photon: Eric Weisstein's World of Physics [home, info]
38. photon: Imagine the Universe! Dictionary [home, info]
39. Photon: Extragalactic Astronomy [home, info]
40. photon: General Chemistry Online [home, info]
41. Photon: NRC Glossary of Nuclear Terms -- [home, info]
42. photon: UNCChem Glossary [home, info]
43. Photon: Atmospheric Chemistry and Air Quality [home, info]
44. Photon: Accelerator Glossary [home, info]
45. photon [1], photon [2]: How Many? A Dictionary of Units of Measurement [home, info]
46. PHOTON: Zoom Astronomy Glossary [home, info]

Slang (1 matching dictionary)

47. Photon: Urban Dictionary [home, info]

Tech (11 matching dictionaries)

48. photon: High-Energy Astrophysics [home, info]
49. photon: Electronics [home, info]
50. photon: Glossary of Related Solar Power Terms [home, info]
51. Photon: AUTOMOTIVE TERMS [home, info]
52. photon: Solar Electric Glossary [home, info]
53. photon: Glossary of Meteorology [home, info]
54. Photon: Explosives [home, info]
55. photon, photon: JPL Terms [home, info]
56. Photon: Glossary of Energy Terms [home, info]
57. PHOTON: Space and Electronic Warfare Lexicon [home, info]
58. photon: Webster's New World Telecom Dictionary [home, info]

(Note: See photons for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (photon) ▸ noun:  a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle ▸ Also see photons ▸ Word origin ▸ Words similar to photon ▸ Usage examples for photon ▸ Popular adjectives describing photon ▸ Words that often appear near photon ▸ Rhymes of photon ▸ Invented words related to photon