A unit of mass used to measure precious metals and defined so that there are 24 grains in 1 pwt.
One pennyweight is equal to 1.555 g.
Grain, Troy System of Units
References
Woolf, H. B. (Ed. in Chief). Webster's New Collegiate Dictionary. Springfield, MA: Merriam, p. 1329, 1980.
© 1996-2007 Eric W. Weisstein
