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n. pl. me·tath·e·ses (-sēz′)
1. Linguistics Transposition within a word of letters, sounds, or syllables, as in the change from Old English brid to modern English bird or in the confusion of modren for modern.
2. Chemistry Double displacement.

[Late Latin, from Greek, from metatithenai, to transpose : meta-, meta- + tithenai, to place; see dhē- in Indo-European roots.]

met′a·thet′ic (mĕt′ə-thĕt′ĭk), met′a·thet′i·cal adj.
met′a·thet′i·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Here we examine the phonologically and etymologically generated cognation of two Luzumiyyas: (1) the -smu rhyme that generated tasmu as the rhyme word and hence semantic kernel of the Tasmu poem, and (2) the lamsi Luzumiyya, in the meter wafir, which features the synonym and metathetic mate of tasm, that is, tarns, as the rhyme word of its second verse.
One attack leaves Dredj playing his horn at the bottom of the ocean, staring up at the flamenco singer Lole Montoyas "metathetic morning boat" that "bulged with voices, some stowaway, some aboveboard." Are those voices enslaved persons on the Middle Passage or perhaps adrift refugees?
Manivannan, "Microwave metathetic approach for the synthesis and characterization of Zn[Cr.sub.2][O.sub.4]," Journal of the European Ceramic Society, vol.