The definition of a fog is a mist of water vapor that is low to the ground, a mist of another liquid, or a state of confusion or blurred vision.(noun)
To fog is defined as to blur, confuse or cover with fog.(verb)
See fog in Webster's New World College Dictionary
Origin: prob. < Scand, as in ON fok, Dan (sne)fog, driving snow, Norw dial. fuka, sea mist < IE base *pū-, to puff up, blow, of echoic orig.
Origin: ME fogge, prob. < Scand as in Norw dial. fogg, long grass in moist place, akin to Ger feucht, damp: see fen
See fog in American Heritage Dictionary 4
Origin: Perhaps of Scandinavian origin.
Origin: Middle English fogge, tall grass; see pū̆- in Indo-European roots.
Learn more about fog