troy unit

/trɔɪ ˌjunət/

Definitions of troy unit

1. noun

   any of the unit of the troy system of weights
   types:

   grain

   1/60 dram; equals an avoirdupois grain or 64.799 milligrams

   pennyweight

   a unit of apothecary weight equal to 24 grains

   apothecaries' ounce, ounce, troy ounce

   a unit of apothecary weight equal to 480 grains or one twelfth of a pound

   apothecaries' pound, troy pound

   an apothecary weight equal to 12 ounces or 373.242 grams

   type of:

   weight, weight unit

   a unit used to measure weight