paragoge

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 addition of a letter or syllable to the end of a word, as withouten for without.

Coaptation.

The addition of a sound, syllable or letter to the end of a word, either through natural development or as a grammatical function.