protium

noun
pro·​ti·​um | \ˈprō-tē-əm, ˈprō-shē-\

Definition of protium 

: the ordinary light hydrogen isotope of atomic mass 1

First Known Use of protium

1933, in the meaning defined above

History and Etymology for protium

New Latin, from Greek prōtos first

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The first known use of protium was in 1933

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protium

noun
pro·​ti·​um | \ˈprōt-ē-əm, ˈprō-shē- \

Medical Definition of protium 

: the ordinary light hydrogen isotope of atomic mass 1

More from Merriam-Webster on protium

Britannica.com: Encyclopedia article about protium

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