isotope
The origin and history of isotope.
Etymology
From Greek iso- ("same") plus -tope ("place"), because isotopes occupy the same position in the periodic table. Coined in 1913 by chemist Frederick Soddy, building on a suggestion by physician Margaret Todd in 1909.
Class of 1913
isotope first entered the language around 1913. Other words from the same year:
See the full Class of 1913 →