potassium-argon

adjective
po·tas·si·um-ar·gon | \pə-ˈta-sē-əm-ˈär-ˌgän \

Definition of potassium-argon 

: being or relating to a method of dating paleontological or geological materials based on the radioactive decay of potassium to argon that has taken place in a specimen

First Known Use of potassium-argon

1953, in the meaning defined above

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The first known use of potassium-argon was in 1953

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