opaci·fi·ca·tion \ōˌpasəfə̇ˈkāshən, ōˌpākə-\noun (-s) Etymology: from opacify, after such pairs as English amplify : amplification : an act or the process of becoming or rendering opaque < opacification of the cornea following ulceration > < opacification of the bile passages for roentgenographic examination >