Met`a*mor"phic (?), a. [See Metamorphosis.]
Subject to change; changeable; variable.
Causing a change of structure.
Pertaining to, produced by, or exhibiting, certain changes which minerals or rocks may have undergone since their original deposition; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.
© Webster 1913.