LAC'MUS, noun A blue pigment, formed from archil, a species of lichen. [See Archil.] It is prepared by bruising the archil, and adding quick lime and putrefied urine, or spirit of urine distilled from lime. The mixture, after cooling and the evaporation of the fluid, becomes a mass of the consistence of paste, which is laid on a board to dry in square lumps.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.