Definition of "sleet"

(chiefly US) Pellets of ice made of mostly frozen raindrops or refrozen melted snowflakes.  examples

(chiefly UK, Ireland, New England) Precipitation in the form of a mixture of rain and snow.  examples

(rare) A smooth coating of ice formed on ground or other objects by freezing rain.

(firearms) Part of a mortar extending from the chamber to the trunnions.  examples

(impersonal, of the weather) To be in a state in which sleet is falling.  quotations  examples