01 a. Subject to change; changeable; variable.
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1.
Subject to change; changeable; variable.
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2.
Causing a change of structure.
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3.
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.(Geol.)