Definition of isotope in English:

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Pronunciation: /ˈīsəˌtōp/


Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Example sentences
  • Radioactive elements have different isotopes that decay at different rates.
  • Beta radiation is the emission of an electron from the nucleus of a radioactive isotope.
  • The nuclei of the hydrogen isotopes are the proton, the deuteron, and the triton.



Pronunciation: /ˌīsəˈtäpik/
Example sentences
  • Ecologists see these isotopic ratios of carbon, hydrogen, oxygen, and nitrogen as signatures.
  • Radiocarbon dating relies on the fact that carbon exists naturally in several isotopic forms.
  • During subsequent logging, samples of core were selected for sectioning and for geochemical, mineralogical and isotopic analysis.


Pronunciation: /ˌīsəˈtäpik(ə)lē/
Example sentences
  • Likewise, isotopically substituted lipid membranes can be differentiated from protein adlayers and even each other with the proper selection of unique isotopic labels.
  • During interglacial periods the ice caps melt and return the isotopically light water to the oceans, where it mixes rapidly.
  • With its origin in the local electron distribution, the chemical shift is a sensitive reporter of the chemical environment of isotopically labeled atoms.


Pronunciation: /ˈīsəˌtäpē/ Pronunciation: /ˈīsəˌtōpē/ Pronunciation: /īˈsädəpē/
Example sentences
  • It is an excellent piece of work which considers loop and quasigroup identities that are invariant under isotopy, proving a number of very interesting results.


1913: coined by F. Soddy, from iso- 'equal' + Greek topos 'place' (because the isotopes occupy the same place in the periodic table of elements).

Words that rhyme with isotope


For editors and proofreaders

Syllabification: i·so·tope

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