Open Lead : An essentially linear, wet opening in the sea ice of navigable width, not thermally induced. A small, wet opening will be considered a crack. (Bul 2N)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}