From Wiktionary, the free dictionary
From cumulo- + granite.
cumulogranite (uncountable)
- (aviation, slang) Solid terrain, such as mountains, obscured by clouds and thus posing a risk to the pilot of an aircraft.
2001, Dale Brown, Battle Born:"That cumulogranite might've just put the fear of God into that squid pilot chasing us," the OSO reminded him.
