chasm 
(kăzəm)
(kăzəm)n.
1. A deep, steep-sided opening in the earth's surface; an abyss or gorge.
2. A sudden interruption of continuity; a gap.
3. A pronounced difference of opinion, interests, or loyalty.
[Latin chasma, from Greek khasma.]
chasmal (kăzməl) adj.