n. A room, building, or workshop especially fitted with suitable apparatus for conducting investigations in any department of science or art, or for elaborating or manufacturing chemical, medicinal, or any similar products: as, a chemical or pharmaceutical laboratory; hence, also, figuratively, any place where or in which similar processes are carried on by natural forces.n. Milit., an establishment for the manufacture of rockets, port-fires, fuses, percussion-caps, quick-and slow-matches, friction-primers, electric primers, etc., designed for military operations.n. The space between the fire and the flue-bridges of a reverberatory furnace in which the work is performed.