'Epenthesis' definitions:

Definition of 'epenthesis'

(from WordNet)
noun
The insertion of a vowel or consonant into a word to make its pronunciation easier; "the insertion of a vowel in the plural of the word `bush' is epenthesis"

Definition of 'Epenthesis'

From: GCIDE
  • Epenthesis \E*pen"the*sis\, n.; pl. Epentheses. [L., fr. Gr. ?; 'epi` + ? to put or set in.] (Gram.) The insertion of a letter or a sound in the body of a word; as, the b in "nimble" from AS. n[=e]mol. [1913 Webster]