n. A body of igneous rock formed beneath the surface of the earth by consolidation of magma
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. large mass of intrusive igneous rock believed to have solidified deep within the earth
Word Usage
"My major issue now is that Ceres is not compositionally very similar to the outer solar system objects, so this "pluton" designation is different than our "jovian" and "terrestrial" designations."