Entry 3 senses · 3 variants Webster, 1913 Sleet /slēt/ · IPA /sliːt/ n. n. v. i. 01 n. The part of a mortar extending from the chamber to the trunnions. 1. The part of a mortar extending from the chamber to the trunnions.(Gun.) 02 n. Hail or snow, mingled with rain, usually falling, or driven by the wind, in fine particles. 1. Hail or snow, mingled with rain, usually falling, or driven by the wind, in fine particles. 03 v. i. To snow or hail with a mixture of rain. imp. & p. p. Sleeted; p. pr. & vb. n. Sleeting 1. To snow or hail with a mixture of rain.