noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   a mass of volcanic or igneous rock found within strata which has spilled downward into underlaying strata and forms depressed regions.
2. 2
   mass similar to laccolith but concave down

Etymology

Ancient Greek λοπός (lopós, “shell”) + λίθος (líthos, “stone”)

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.