To dirty; smear.n. A semi-fluid mixture of various earths, clays, or pulverized minerals with water: a term used with a variety of meanings in the arts; specifically, a semi-fluid mixture of some refractory material, as ganister, with water: used for repairs about the bottom and twyerholes of the Bessemer convertern. A product of the silver-smelting process as carried on in England and Wales, consisting of a mixture of the sulphurets and arseniurets of copper, lead, and silver, and sometimes containing nickel, cobalt, and other metals.n. In the manufacture of Portland cement, the mixture of silicious and calcareous ingredients in due proportion, brought to the consistence of a fluid mud by the addition of a sufficient amount of water, so as to insure intimate and uniform admixture before drying and burning the solid material.n. In ceramics, inequalities in the interior of a pottery vessel which are smoothed by the rib or profile held in the left hand of the workman as the wheel revolves, while a damp sponge, held in the right hand, smooths the exterior.