potassium-argon
adjective
po·tas·si·um-ar·gon pə-ˈta-sē-əm-ˈär-ˌgän 
: being or relating to a method of dating paleontological or geologic materials based on the radioactive decay of potassium to argon that has taken place in a specimen
Word History
First Known Use
1953, in the meaning defined above
- impregning
- impregns
- impresa
- impresarial
- impresario
- impresarios
- impresas
- imprescribable
- imprescriptibility
- imprese
- impreses
- impress
- impressable
- impressed
- impressed species
- impressed stamp
- impressed watermark
- impresser
- impresses
- impressibilities
- impressibility
- impressible
- impressing
- impression
- impression cylinder