tme·sis (tmē'sĭs, mē'-) n.
pl.tme·ses (-sēz) Separation of the parts of a compound word by one or more intervening words; for example, where I go ever instead of wherever I go.
[Late Latin tmēsis, from Greek, a cutting, from temnein, to cut; see tem- in Indo-European roots.]
1577, from Gk. tmesis "a cutting," related to temein "to cut," tome "a cutting" (see tome). The separation of the elements of a compound word by the interposition of another word or words (e.g. a whole nother).