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Webster 1913 Edition

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Noun.

[Gr. [GREEK] a cistern +

-lite

-lith

(Geol.)

A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.

–

Lacˊco-lit′ic

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Adj.

laccolith ‎(plural laccoliths)

(geology) a mass of igneous or volcanic rock found within strata which forces the overlaying strata upwards and forms domes.
mass similar to lopolith but concave up.