US Customary System
Short for United States Customary System. The main system of weights and measures used in the United States and a few other countries. The system is based on the yard as a unit of length, the pound as a unit of weight, the gallon as a unit of liquid volume, and the bushel as a unit of dry volume. See Table at measurement. Compare metric system.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.