Designed to resist, prevent, or reduce fogging or clouding on a surface, especially eyeglasses or mirrors.
From anti- (against) + huff (the moisture that creates fogging when you breathe on a surface). This is a colloquial compound that emerged from everyday language about breath fogging.
Those special coatings on ski goggles and bathroom mirrors that keep them from fogging up are antihuff treatments—it's such a practical problem that it got its own everyday word!
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