met·a·plasm 1 
(mĕtə-plăz′əm)
(mĕtə-plăz′əm)n.
Alteration of a word by the addition, omission, or transposition of sounds or syllables or the letters that represent them.
[Middle English metaplasmus, from Latin, from Greek metaplasmos, remodeling, from metaplassein, to remold : meta-, meta- + plassein, to mold; see pelə-2 in the Appendix of Indo-European roots.]
met′a·plastic (-plăstĭk), met′a·plasmic (-plăzmĭk) adj.