a saucer- or lens-shaped body of intrusive igneous rock, formed by the penetration of magma between the beds or layers of existing rock and subsequent subsidence beneath the intrusion
Compare laccolith
Word origin
C20: from Greek lopas dish + -lith
lopolith in American English
(ˈlɑpəlɪθ)
noun
Geology
a mass of igneous rock similar to a laccolith but concave downward rather than upward