ametabolic metamorphosis

from The Collaborative International Dictionary of English v.0.48

nonmetamorphic \nonmetamorphic\ adj.
   1. not metamorphic. Opposite of {metamorphic}. [Narrower
      terms: {ametabolic metamorphosis)}]
      [WordNet 1.5]

   2. (Geol.) not produced by metamorphosis. {metamorphic}
      [WordNet 1.5]