From The Collaborative International Dictionary of English v.0.48:

Metamorphic \Met`a*mor"phic\, a. [See Metamorphosis.]
   1. Subject to change; changeable; variable.
      [1913 Webster]

   2. Causing a change of structure.
      [1913 Webster]

   3. (Geol.) 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.
      [1913 Webster]
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