From Longman Dictionary of Contemporary EnglishMercMerc /mɜːk $ mɜːrk/ noun [countable] 1 especially British English an informal name for a Mercedes-Benz car2 American English an informal name for a car called the Mercury, made by FordFrom Longman Business DictionaryMercMerc /mɜːkmɜːrk/ noun [countable]FINANCE another name for MERCANTILE EXCHANGEOn the New York Merc, gasoline jumped 5.15 cents.