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.

able to adapt adaptable adjustable allotropic alterable alterative anabolic catabolic catalytic changeable checkered diversiform ever-changing flexible fluid heteromorphic heteromorphous impermanent kaleidoscopic malleable manifold many-sided metabolic metamorphotic metastatic mobile modifiable movable multifarious multifold multiform multiphase multiple multiplex mutable nonuniform permutable plastic polymorphic polymorphous protean proteiform resilient rubbery supple transient transitory variable