From Longman Dictionary of Contemporary Englishsilver dollarˌsilver ˈdollar noun [countable] PECa one-dollar coin that was used in the US in the past
Examples from the Corpus
silver dollar• The entire device is held together by a metal frame roughly the size of a silver dollar.• Virgil Glover himself seeing Tom Glover doing rather badly, shining like a brass tack next to a silver dollar.• Three new coins have been minted, gold five dollar, silver dollar and clad half dollar. 