HALF DOLLAR, money. A silver coin of the United States of the value of fifty cents. It weighs two hundred and six and one-fourth grains. Of one thousand parts, nine hundred are of pure silver, and one hundred of alloy. Act of January 18, 1837, S. 8 and 9, 4 Sharsw. cont. of Story's L. U. S.2523, 4. Vide Money.