nonassociated

adjective

non·​as·​so·​ci·​at·​ed ˌnän-ə-ˈsō-shē-ˌā-təd 

-sē-

: not associated with someone or something else : unassociated

especially, of natural gas : not found in the same reservoir with petroleum deposits

When wells are drilled along this coast, they commonly encounter "nonassociated" gas—natural gas not associated with oil—under very high pressure.

—Barry Commoner

Word History

First Known Use

1695, in the meaning defined above