air-hole DCHP-1 (pre-1967)
1 n.
a hole in the ice, especially where the water is moving too swiftly to freeze.
2 n.
an opening in the ice, made as a breathing-hole by some animal.
See also: aglu breathing-hole water-hole (def. 2)
3 n.
an opening in rotten ice.
See also: rotten