n. epenthesis of a vowel – insertion of a vowel. For example, the middle ‘-a-’ in thataway, or use of infixes -i- and -o- in coining English words on classical roots.
The Century Dictionary and Cyclopedia
n. In phonetics, the involuntary utterance of an auxiliary vowel, especially before r, l, m, and n, in certain positions, as in lucre, able, chasm, etc.
Word Usage
"I might also be interested to find out that vowel insertion is widespread enough in the world's languages to have a name, epenthesis also called anaptyxis."