Etymology
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pluton (n.)

in geology, "large, intrusive body of igneous rock formed beneath the earth's surface," 1936, Modern Latin, from the geological sense of plutonic (q.v.).

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Definitions of pluton

pluton (n.)
large mass of intrusive igneous rock believed to have solidified deep within the earth;
Synonyms: batholith / batholite / plutonic rock
From wordnet.princeton.edu