ret·ro·nym英ˈretrəˌnɪm美ˈrɛtrəˌnɪmAHDrĕtʹrə-nĭm' 基本英英 n.当某事物的原名不再适用的时候为它造的新词¹⁰⁰;如“第一次世界大战World War I”;其在二战之前叫做“大战”the Great War Noun: a word introduced because an existing term has become inadequate;
Nobody ever heard of analog clocks until digital clocks became common, so `analog clock' is a retronym