DCHP-1 Online
jam ice Obs. 
See 1792 quote.
- 1771 (1792) The main body of jam ice being not more than four miles off, rendered it very dangerous to keep the sea.
- 1792 Jam Ice. The low ice with which the whole face of the ocean is covered every winter, and until late in the summer.
- 1771 (1792) The main body of jam ice being not more than four miles off, rendered it very dangerous to keep the sea.