To recover bottom-hole fluids, samples, or drill cuttings by lowering a cylindrical vessel, called a bailer, to the bottom of a well, filling it, and retrieving it. Also, a link of steel attached to pipe elevators for living. (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}