Crevasse
Crevasse (kr?`v?s") , noun
[F. See Crevice.]
1.
A deep crevice or fissure, as in embankment; one of the clefts or fissure by which the mass of a glacier is divided.
2.
A breach in the levee or embankment of a river, caused by the pressure of the water, as on the lower Mississippi. [United States]