ETYM AS. deáw; akin to Dutch dauw, German thau, tau, Icel. dögg, Swed. dagg, Dan. dug; cf. Skr. dhav, dhâv, to flow. Related to Dag dew.
(Homonym: do, due).
Water that has condensed on a cool surface overnight from water vapor in the air.
Precipitation in the form of moisture that collects on the ground. It forms after the temperature of the ground has fallen below the dew point of the air in contact with it. As the temperature falls during the night, the air and its water vapor become chilled, and condensation takes place on the cooled surfaces.