(1):

(v. t.) The material of which glass is made, after having been calcined or partly fused in a furnace, but before vitrification. It is a composition of silex and alkali, occasionally with other ingredients.

(2):

(v. t.) The material for glaze of pottery.

(3):

(v. t.) To prepare by heat (the materials for making glass); to fuse partially.

(4):

(v. t.) To fritter; - with away.