Definition of Plutonic
Plu`ton´ic
a.
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
.
Plutonic action
(Geol.)
the
influence
of
volcanic
heat
and
other
subterranean
forces
under
pressure
.
Plutonic rocks
(Geol.)
granite
,
porphyry
,
and
some
other
igneous
rocks
,
supposed
to
have
consolidated
from
a
melted
state
at
a
great
depth
from
the
surface
.
Cf
.
Intrusive
rocks
,
under
Intrusive
.
Plutonic theory
(Geol.)
See
Plutonism
.
Related Words
eruptive
,
intrusive
,
irruptive
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