isotope
noun
iso·tope ˈī-sə-ˌtōp 
1
: any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties
2
: nuclide
isotopic
ˌī-sə-ˈtä-pik -ˈtō-
adjective -ˈtō- isotopically
ˌī-sə-ˈtä-pi-k(ə-)lē -ˈtō-
adverb -ˈtō- 
Example Sentences
Recent Examples on the Web Tritium, a second isotope of the same material, may be there as well. 
Kat Friedrich, Popular Mechanics, 13 Sep. 2022 This is called paleolimnology, where researchers take the mud out of the bottom of lakes and scan that sediment for an isotope, Nitrogen-15. Isabelle Ross, Anchorage Daily News, 21 July 2022 This isotope buildup is calibrated to temperature, but that calibration requires knowing ocean salinity and how much water is locked up in ice caps. Howard Lee, Ars Technica, 30 Aug. 2022 Together, the two produce an isotope called germanium 71. Caroline Delbert, Popular Mechanics, 11 July 2022 The isotope records suggested that the fish's annual growth, which would coincide with the peak availability of its prey in summer, hadn't yet been reached. Katie Hunt, CNN, 23 Feb. 2022 The team also discovered another cluster of outlying isotope compositions dated between 1648 and 1660, years that correspond to the Eighty Years’ War or the Dutch War of Independence, according to UPI. Nora Mcgreevy, Smithsonian Magazine, 16 Dec. 2021 The second is the oxygen isotope ratios themselves. John Timmer, Ars Technica, 11 Aug. 2022 Atom Computing creates spin qubits by using unique energy levels in the isotope Strontium-87. Paul Smith-goodson, Forbes, 2 June 2022 See More
Kat Friedrich, Popular Mechanics, 13 Sep. 2022 This is called paleolimnology, where researchers take the mud out of the bottom of lakes and scan that sediment for an isotope, Nitrogen-15. Isabelle Ross, Anchorage Daily News, 21 July 2022 This isotope buildup is calibrated to temperature, but that calibration requires knowing ocean salinity and how much water is locked up in ice caps. Howard Lee, Ars Technica, 30 Aug. 2022 Together, the two produce an isotope called germanium 71. Caroline Delbert, Popular Mechanics, 11 July 2022 The isotope records suggested that the fish's annual growth, which would coincide with the peak availability of its prey in summer, hadn't yet been reached. Katie Hunt, CNN, 23 Feb. 2022 The team also discovered another cluster of outlying isotope compositions dated between 1648 and 1660, years that correspond to the Eighty Years’ War or the Dutch War of Independence, according to UPI. Nora Mcgreevy, Smithsonian Magazine, 16 Dec. 2021 The second is the oxygen isotope ratios themselves. John Timmer, Ars Technica, 11 Aug. 2022 Atom Computing creates spin qubits by using unique energy levels in the isotope Strontium-87. Paul Smith-goodson, Forbes, 2 June 2022 See More Word History
Etymology
is- + Greek topos place
First Known Use
1913, in the meaning defined at sense 1
Medical Definition
isotope
noun
iso·tope ˈī-sə-ˌtōp
1
: any of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties
2
: nuclide