From Longman Dictionary of Contemporary Englishhalf dollarˌhalf ˈdollar noun [countable] PECan American or Canadian coin worth 50 cents
Examples from the Corpus
half dollar• For this trick all you need is a small coin such as a fifty-pence piece or a half dollar.• Three new coins have been minted, gold five dollar, silver dollar and clad half dollar.• The D-777 is controlled by a tiny remote the size of a Kennedy half dollar attached about half way up the earphones chord.From Longman Business Dictionaryhalf-dollarˌhalf-ˈdollar noun [countable] an American or Canadian coin worth 50 cents → see also dollar 