"large saw used for cutting timber, operated by two men, one (the pit-sawyer) standing in the pit below the log that is being sawed, the other (the top-sawyer) standing on the log," 1670s, from pit (n.) + saw (n.1).
pitiful
pitiless
Pitman
piton
pits
pit-saw
pittance
pitter
pitter-patter
Pittsburgh
pituitary