epenthesis
noun
epen·the·sis
i-ˈpen(t)-thə-səs
e-
plural epentheses
i-ˈpen(t)-thə-ˌsēz
e-
: the insertion or development of a sound or letter in the body of a word (such as \ə\ in \ˈa-thə-ˌlēt\ athlete)
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Merriam-Webster unabridged
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