hyperthesis

from The Century Dictionary.

• noun In ancient prosody, interchange of quantity in two successive places of a logaœdic series, so that in one of two lines metrically corresponding, as in strophe and antistrophe, a long is apparently transferred to a position before a short, which it would normally succeed, or a short transferred so as to exchange places with a preceding long. See polyschematic.
• noun In Philol., a transfer or “'attraction” of a letter from the syllable to which it originally belonged to another syllable immediately preceding or following it; orthographic transposition, or metathesis: thus, in Greek, μέλαινα is used for μελανια.
• noun In the Gr. Ch., a fast in addition to those regularly observed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A form of metathesis in which non-contiguous sounds are switched.