noun.
The addition, by growth or accident, of a non-significant letter or syllable to the end of a word: opposed to prosthesis and apocope. Examples are len-d, amongs-t, agains-t, whils-t, tyran-t. Also called epithesis and ectasis.
the GNU version of the Collaborative International Dictionary of English
noun.
The addition of a letter or syllable to the end of a word, as withouten for without.