From Longman Dictionary of Contemporary Englishcircular sawˌcircular ˈsaw noun [countable] 
TZan electric tool with a round metal blade that has small sharp parts around the edge, used for cutting wood
TZan electric tool with a round metal blade that has small sharp parts around the edge, used for cutting woodExamples from the Corpus
circular saw• Their versatility means a circular saw is not always needed.• A circular saw screeched and the smell of fresh sawdust was everywhere.• If you already own a jigsaw and circular saw, the Cut Saw is probably not for you.• The spikes can destroy a chainsaw or circular saw. 