Definify.com
Webster 1913 Edition
Plutonism
Plu′to-nism
,Noun.
[Cf. F.
plutonisme
.] The theory, early advanced in geology, that the successive rocks of the earth’s crust were formed by igneous fusion; – opposed to the Neptunian theory.
Definition 2024
plutonism
plutonism
English
Noun
plutonism (countable and uncountable, plural plutonisms)
- The old geological theory that the rocks forming the Earth were formed in fire by volcanic activity, with a continuing gradual process of weathering and erosion, then deposited on the sea bed, re-formed into layers of sedimentary rock by heat and pressure, and raised again.