OPACIFIER Meaning of OPACIFIER in English ̷ ̷ˈ ̷ ̷ ̷ ̷ˌfī(ə)r noun( -s ) : a constituent or additive (as of an enamel, a paint, a glass) that tends to opacify the system of which it is a part Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012