[a resinous substance produced mainly on the banyan tree, but to some extent on other trees, by the coccus lacca, a scale-shaped insect, the female of which fixes herself on the bark, and exudes from the margin of her body this resinous substance. Stick-lac is the substance in its natural state, incrusting small twigs. When broken off, and the colouring matter partly removed, the granular residuum is called seed-lac. When melted, and reduced to a thin crust, it is called shell-lac or shellac. lac is an important ingredient in sealing wax, dyes, varnishes, and lacquers. Ceylon lac, a resinous exudation of the tree Croton lacciferum, resembling lac. lac dye, a scarlet dye obtained from stick-lac. lac lake, the colouring matter of lac dye when precipitated from its solutions by alum. mexican lac, an exudation of the tree Croton draco. Origin: Per. Lak; akin to Skr. Laksha: cf. f. Lague, It. & NL. lacca. cf. lake a colour, lacquer, litmus.