avoirdupois weight
(Mechanics) The system of units which has been commonly used in Englishspeaking countries for measurement of the mass of any substance except precious stones, precious metals, and drugs; it is based on the pound (approximately 453.6 grams) and includes the shortton (2000 pounds), long ton (2240 pounds), ounce (one-sixteenth pound), and dram (onesixteenth ounce).
