slit or cut made by a saw. Space created by a saw cut (the width of the chain or blade).
Merriam-Webster Online Dictionarykerf (noun)
a slit or notch made by a saw or cutting torch
the width of cut made by a saw or cutting torch
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A crosscut hand saw about 620 mm (24 inches) long
A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge. It is used to cut through material, very often wood though sometimes metal or stone. The cut is made by placing the toothed edge against the material and moving it forcefully forth and less forcefully back or continuously forward. This force may be applied by hand, or powered by steam, water, electricity or other power source. An abrasive saw has a powered circular blade designed to cut through metal or ceramic.