DCHP-1 Online
slick 
n. a smooth, unruffled patch on the surface of fast moving water.
- 1964 Now in November it [the river] was nearly choked ; a mad race of water in the middle flung rafts of ice to the sides, burrowed under ice bridges, and showed in roils and slicks as far as could be seen. Soon a man could drive right across.
- 1964 Now in November it [the river] was nearly choked ; a mad race of water in the middle flung rafts of ice to the sides, burrowed under ice bridges, and showed in roils and slicks as far as could be seen. Soon a man could drive right across.