[ ploot-n-iz-uh m ]
/ ˈplut nˌɪz əm /
the intrusion of magma and associated deep-seated processes within the earth's crust.
(often initial capital letter) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97).
Related formsplu·to·nist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019