The action of making something opaque or cloudy(noun)
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Use "opacification" in a sentence
"The Reykjavik Eye Study – prevalence of lens opacification with reference to identical Japanese studies."
"Consequently, strategies to prevent opacification hold promise for reducing this enormous public health burden."
"Pour steaming consommé into a bowl containing raw scallops or small cubes of fish, and the diner can witness their instant opacification and savor the evolution of their texture."