portable power saw with teeth linked in a loop of chain.
Merriam-Webster Online Dictionarychain saw (noun)
a portable power saw that has teeth linked together to form an endless chain
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chain saw (Wikipedia)
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A chainsaw (alternatively spelled chain saw) is a portable, mechanical saw which cuts with a set of teeth attached to a rotating chain that runs along a guide bar. It is used in activities such as tree felling, limbing, bucking, pruning, cutting firebreaks in wildland fire suppression and harvesting of firewood. Chainsaws with specially designed bar and chain combinations have been developed as tools for use in chainsaw art and chainsaw mills. Specialized chainsaws are used for cutting concrete. Chainsaws are sometimes used for cutting ice, for example for ice sculpture and in Finland for winter swimming. Someone who uses a saw is a sawyer.