出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2010/11/02 21:45 UTC 版)
A pennyweight (abbreviated dwt) is a unit of mass that is equal to 24 grains, 1/240 of a troy pound, 1/20 of a troy ounce, approximately 0.054857 avoirdupois ounce and approximately 1.555 grams.