Metathesis

Transposition, as of the letters or syllables of a word; as, pistris for pristis; meagre for meager.

A mere change in place of a morbid substance, without removal from the body.

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.

a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)