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Me*tath"e*sis (?), 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.

{ Met`a*thet"ic (?), Met`a*thet"ic*al (?), }
a. Of or pertaining to metathesis.

Met`a*tho*rac"ic (?), a.
(Zoöl.) Of or pertaining to the
metathorax.

Met`a*tho"rax (?), n.


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