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Metath"esis (), n.; pl. Metatheses (). [L., fr. Gr. meta°thesis, fr. metatithe°nai to place differently, to transpose; meta° beyond, over + tithe°nai to place, set. See Thesis.] 1. (Gram.) Transposition, as of the letters or syllables of a word; as, pistris for pristis; meagre for meager. 2. (Med.) A mere change in place of a morbid substance, without removal from the body. 3. (Chem.) The act, process, or result of exchange, substitution, or replacement of atoms and radicals; thus, by metathesis an acid gives up all or part of its hydrogen, takes on an equivalent amount of a metal or base, and forms a salt.
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