avoirdupois weight /av′ərdəpoiz″/ [OF, avoir de pois, to have weight] , the English system of weights in which there are 7000 grains, 256 drams, or 16 ounces to 1 pound. One ounce in this system equals 28.35 g, and 1 pound equals 453.59 g. Compare apothecaries’ weight. See also metric system.
