sleet /sliːt/noun 4verb 1forms 3 noun4 •(US) Pellets of ice made of mostly-frozen raindrops or refrozen melted snowflakes. •(US, UK) Precipitation in the form of a mixture of rain and snow.Though it never really snows it’s more like horizontal sleet — 2007 •(rare) A smooth coating of ice formed on ground or other objects by freezing rain. •The part of a mortar extending from the chamber to the trunnions. verb1 •To be in a state in which sleet is falling.I won't bother going out until it's stopped sleeting. formssleeted · sleeting · sleets