Added 9 October 2026 opacification noun Categories: ActionsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about opacification at Wordnik → Where our words come from → The process of becoming cloudy or opaque. Related Words: foggingtransparentizationopalizationhazeradiopacificationporosificationimpurificationcloudificationcolmationmattificationviscidation Back to today's word