From Longman Dictionary of Contemporary Englishmaracasma‧ra‧cas /məˈrækəz $ -ˈrɑː-, -ˈræ-/ noun [plural] 
APMa pair of hollow balls with handles, filled with small objects, that you shake and use as a musical instrument
APMa pair of hollow balls with handles, filled with small objects, that you shake and use as a musical instrumentExamples from the Corpus
maracas• Not only did he bed Pat last night but some one is about to burst in and catch her rattling his maracas.• However, no amount of maracas and twangy guitars can eliminate the sense of having been shortchanged.• Try penny whistles, maracas, guitars, recorders, bongo drums and the piano for melodious fun.Origin maracas (1600-1700) Portuguese maraca (singular), from Tupi maraka 