noun.
A portable power saw with teeth linked to form a loop of chain.
The Century Dictionary and Cyclopedia
noun.
A surgical saw, consisting of a chain the links of which have a serrated edge, used in amputations between small bones on account of its adjustability.
the GNU version of the Collaborative International Dictionary of English
noun.
a portable power saw having teeth that are linked to form an endless chain, rotated about two pivot points by a power mechanism, such as an electric motor or a gasoline engine.