Definition of laccolite in US English:

laccolite

noun

Geology
rare
  • A mass of igneous rock, typically lens-shaped, that has been intruded between rock strata causing uplift in the shape of a dome. Now more commonly called laccolith.

Origin

Late 19th century. From ancient Greek λάκκος reservoir, tank (from the same Indo-European base as classical Latin lacus) + -lite.

Pronunciation

laccolite

/ˈlakəlʌɪt/