troy ounce uncommon noun 1. a unit of apothecary weight equal to 480 grains or one twelfth of a pound Synonymsouncetroy ounceapothecaries' ounce Related words Broader terms apothecaries' unittroy unit Parts troy pound Part of pennyweightdram WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
