Relating to or characterized by change or transformation, especially in a geological context where rocks are altered in structure or composition by heat, pressure, or other natural agencies.

The metamorphic rocks in the region were formed under intense heat and pressure over millions of years.

Undergoing, capable of, or causing a striking or complete change in form or nature, especially through biological metamorphosis or figurative transformation.

The caterpillar enters a metamorphic stage before emerging as a butterfly.