metathetic

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me·tath·e·sis

M0249800 (mĭ-tăth′ĭ-sĭs)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.