Usually means: Subatomic particle, positive charge, nucleus.
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We found 54 dictionaries that define the word proton:

General (22 matching dictionaries)
  1. proton: Longman Dictionary of Contemporary English
  2. proton: Merriam-Webster
  3. proton: Oxford Learner's Dictionaries
  4. proton: American Heritage Dictionary of the English Language
  5. proton: Collins English Dictionary
  6. proton: Vocabulary.com
  7. Proton, proton: Wordnik
  8. proton: Cambridge Advanced Learner's Dictionary
  9. proton: Wiktionary
  10. proton: Webster's New World College Dictionary, 4th Ed.
  11. proton: The Wordsmyth English Dictionary-Thesaurus
  12. proton: Infoplease Dictionary
  13. proton: Dictionary.com
  14. proton: Online Etymology Dictionary
  15. proton: Cambridge Essential American English Dictionary
  16. Proton (Compatibility layer), Proton (automobile), Proton (band), Proton (bank card), Proton (car), Proton (carmaker), Proton (company), Proton (compatibility layer), Proton (disambiguation), Proton (physics), Proton (rocket), Proton (rocket family), Proton (software), Proton (supermarkets), Proton: Wikipedia, the Free Encyclopedia
  17. proton: Rhymezone
  18. proton: FreeDictionary.org
  19. proton: Mnemonic Dictionary
  20. proton: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (2 matching dictionaries)
  1. PROTON: Free On-line Dictionary of Computing
  2. Proton (physics), proton: Encyclopedia

Medicine (8 matching dictionaries)
  1. proton: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. proton: Prostate Cancer Interactive Glossary
  5. DICTIONARY OF TERMS IN ORAL PHYSIOLOGY (No longer online)
  6. Neurotrauma Glossary (No longer online)
  7. proton: Dictionary of Cancer Terms
  8. Proton (physics), proton: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Encyclopedia of Graphic Symbols (No longer online)
  2. PROTON: Acronym Finder

Science (11 matching dictionaries)
  1. Electrochemistry Dictionary (No longer online)
  2. From Stargazers to Starships Glossary (No longer online)
  3. Chemistry Dictionary (No longer online)
  4. Proton: Eric Weisstein's World of Physics
  5. Illustrated Glossary of Geologic Terms (No longer online)
  6. Imagine the Universe! Dictionary (No longer online)
  7. Proton: Extragalactic Astronomy
  8. Proton: NRC Glossary of Nuclear Terms --
  9. proton: UNCChem Glossary
  10. Accelerator Glossary (No longer online)
  11. PROTON: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. proton: Urban Dictionary

Tech (7 matching dictionaries)
  1. High-Energy Astrophysics (No longer online)
  2. proton: Electronics
  3. AUTOMOTIVE TERMS (No longer online)
  4. Glossary of Meteorology (No longer online)
  5. Explosives (No longer online)
  6. JPL Terms (No longer online)
  7. National Weather Service Glossary (No longer online)

(Note: See protonic as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (physics) A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark.
noun:  The atomic nucleus of protium (hydrogen-1)
noun:  (obsolete, anatomy) Synonym of primordium

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