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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Of or pertaining to pluto; plutonian; hence, pertaining to the interior of the earth; subterranean.

2. Of, pertaining to, or designating, the system of the Plutonists; igneous; as, the Plutonic theory.

(Science: geology) Plutonic action See plutonism.

Origin: Cf. F. Plutonique. See Pluto.