Meaning

noun water that has condensed on a cool surface overnight from water vapor in the air

originFrom Middle English dew, from Old English dēaw (“dew”), from Proto-West Germanic *dauw, from Proto-Germanic *dawwaz, *dawwą (“dew, moisture”), from Proto-Indo-European *dʰewh₂- (“smoke, haze”). Cognate with German Tau, Dutch dauw and Afrikaans dou. Doublet of dag.

Etymology from Wiktionary, CC BY-SA 3.0