epen·the·sis /ɪˈpɛn(t)θəsəs, ɛ-/
插字,插音
E·pen·the·sis n.; pl. Epentheses Gram. The insertion of a letter or a sound in the body of a word; as, the b in “nimble” from AS. nēmol.
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epenthesis
n : 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"
[also: epentheses (pl)]