Usually means: Atoms with same protons, different neutrons.
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We found 49 dictionaries that define the word isotope:

General (21 matching dictionaries)
  1. isotope: Merriam-Webster
  2. isotope: Oxford Learner's Dictionaries
  3. isotope: Collins English Dictionary
  4. isotope: Vocabulary.com
  5. Isotope, isotope: Wordnik
  6. isotope: Cambridge Advanced Learner's Dictionary
  7. isotope: Wiktionary
  8. isotope: Webster's New World College Dictionary, 4th Ed.
  9. isotope: The Wordsmyth English Dictionary-Thesaurus
  10. isotope: Infoplease Dictionary
  11. isotope: Dictionary.com
  12. isotope: Online Etymology Dictionary
  13. Isotope (album), Isotope (band), Isotope (disambiguation), Isotope: Wikipedia, the Free Encyclopedia
  14. isotope: Rhymezone
  15. isotope: Stammtisch Beau Fleuve Acronyms
  16. isotope: FreeDictionary.org
  17. isotope: Mnemonic Dictionary
  18. isotope: TheFreeDictionary.com
  19. isotope: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. isotope: Encyclopedia

Medicine (8 matching dictionaries)
  1. isotope: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Isotope: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. isotope: Dictionary of Cancer Terms
  6. isotope: Medical dictionary
  7. Isotope: Drug Medical Dictionary
  8. Hyperdictionary (No longer online)

Science (15 matching dictionaries)
  1. Archaeology Wordsmith (No longer online)
  2. Drug Discovery and Development (No longer online)
  3. Isotope: Biology dictionary
  4. Isotope: Eric Weisstein's World of Mathematics
  5. Isotope: Eric Weisstein's World of Physics
  6. Illustrated Glossary of Geologic Terms (No longer online)
  7. Isotope: Extragalactic Astronomy
  8. General Chemistry Online (No longer online)
  9. isotope: Dictionary of Geology
  10. isotope: Evolution Glossary
  11. isotope, isotope: PlanetMath Encyclopedia
  12. Isotope: NRC Glossary of Nuclear Terms --
  13. isotope: Natural History Terms
  14. AGRICULTURAL AND ENVIRONMENTAL BIOTECHNOLOGY (No longer online)
  15. ISOTOPE: Zoom Astronomy Glossary

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

Tech (3 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. Explosives (No longer online)
  3. Nuclear Terms (No longer online)

(Note: See isotopes as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (nuclear physics) Any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei. Thus, isotopes have the same atomic number but a different mass number.
verb:  (topology, transitive) To define or demonstrate an isotopy of (one map with another).

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