Designed to prevent or counteract fogging, or to reduce the haze and obscuration caused by mist or vapor.
From anti- + fog + -matic (pertaining to). Somewhat archaic or technical variant of antifoggant, formed with the -matic suffix.
Divers and military personnel use antifogmatic equipment like mask inserts and lens coatings because underwater and in extreme conditions, fogged vision can be literally deadly.
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