radiopaque

adjective
ra·​di·​opaque | \ˌrā-dē-ō-ˈpāk \

Definition of radiopaque 

: being opaque to various forms of radiation (such as X-rays)

First Known Use of radiopaque

1917, in the meaning defined above

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The first known use of radiopaque was in 1917

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radiopaque

adjective
ra·​di·​opaque | \-ō-ˈpāk \

Medical Definition of radiopaque 

: being opaque to radiation and especially X-rays radiopaque dyes — compare radiolucent

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