1 Geology Relating to or denoting igneous rock formed by solidification at considerable depth beneath the earth’s surface.
More example sentences
- The Median Tectonic Zone, which separates the Western and Eastern Provinces, is a narrow belt of Late Palaeozoic and Mesozoic plutonic rocks with minor volcanic and metasedimentary units.
- However, Lower Cretaceous plutonic rocks have not been found in outcrop.
- The magmatic fabric of a plutonic rock forms during a relatively short time interval, after ascent and before final crystallization of magma.
Definition of plutonic in:
- The British & World English dictionary