From Longman Dictionary of Contemporary Englishsnare drumˈsnare drum noun [countable] 
APMa small flat drum that makes a hard continuous sound when you hit it
APMa small flat drum that makes a hard continuous sound when you hit itExamples from the Corpus
snare drum• The electronic click startled him, as if it were the beat of a snare drum.• He didn't understand that it was in four and that the snare drum was on beats two and four. 