Epenthesis
Pronunciation : E*pen"the*sis
Part of Speech : n.;
Etymology : [L., fr. Gr. (Gram.)
Definition : Defn: The insertion of a letter or a sound in the body of a word; as, the b in "nimble" from AS. nemol.
pl. Epentheses.
Source : Webster's Unabridged Dictionary, 1913