from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A mass of igneous rock intruded between layers of sedimentary rock, resulting in uplift.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a mass of igneous or volcanic rock found within strata which forces the overlaying strata upwards and forms domes.
- n. mass similar to lopolith but concave up.
from The Century Dictionary and Cyclopedia
- n. A name given by G. K. Gilbert to masses of lava which, when rising from below, have not found their way to the surface, but have spread out laterally, and formed a lenticular aggregation, thereby lifting the rocks above into dome-shaped forms.
Greek lakkos, pond, cistern + -lith.(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek λάκκος (lakkos, "cistern") + λίθος (lithos, "stone") (Wiktionary)