METAMORPHIC

a.

3 definitions — Webster’s Dictionary (1828)


1.
a.

Subject to change; changeable; variable.

2.
a.

Causing a change of structure.

3.
a.

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.