1. Transfer of a pathologic product ( e.g., a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body. 2. In chemistry, a double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C. [meta- + G. thesis, a placing]
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me·tath·e·sis (mə-tathґə-sis) [meta- + Gr. thesis placement] 1. the artificial transfer of a morbid process. 2. a chemical reaction in which an element or radical in one compound exchanges places with another element or radical in another compound.Medical dictionary. 2011.