Source : Webster's Revised Unabridged Dictionary (1913)

Laccolite \Lac"co*lite\, Laccolith \Lac"co*lith\, n. [Gr. ? a
   cistern + -lite, -lith.] (Geol.)
   A mass of igneous rock intruded between sedimentary beds and
   resulting in a mammiform bulging of the overlying strata. --
   {Lac`co*lit"ic}, a.