n. One who or that which equalizes or makes equal; an adjuster; a leveler.n. Specifically, a pivoted bar attached to the pole of a wagon and carrying at its ends the swingletrees to which the horses are attached; an evener. Also called equalizing-bar.n. Also spelled equaliser.n. In a wide sense, any form of balanced bar designed to equalize irregular strains, as in the buffers of a car-platform or the springs used to keep a car-vestibule closed under the swaying of the cars when in motion.n. A box or tank, loosely filled with sand, coke, sawdust, or other cleansing material, through which the gas from a producer is passed to make its quality uniform.