from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An anticlinal fold in which a mobile core, such as salt or gypsum, has pierced through the more brittle overlying rock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An intrusion of a ductile rock into an overburden.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata
French, from Greek diapeirein, to push through : dia-, dia- + peirein, to pierce; see per-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek διαπειραίνω (diapeirainō, "to pierce through"). (Wiktionary)