frost smoke (frostsmok)

A fog of minute ice-needles, resembling smoke, observed over bodies of water in a time of severe cold. At O, where is faith? O, where is loyalty? If it be banish'd from the frosty head, Where shall it find a harbour in the earth? Shak., 2 Hen. VI., v. 1. 5. Specifically, in entom ., glistening like hoar frost: an appearance generally due to minute white hairs. When seen laterally the surface appears frosty white. Packard.