IPA: /ˌɛpənˈθɛtɪk/
KK: /ɛpɛnˈθɛtɪk/
Relating to the insertion of sounds or syllables into a word to make pronunciation easier or to fit a particular phonetic pattern.
In linguistics, an epenthetic vowel may be added to help with the flow of speech.
Epenthetic → It is formed from "epenthesis" (from Greek "epenthesis", meaning addition) and the suffix "-ic" (meaning pertaining to). The word "epenthetic" refers to something that pertains to the addition of sounds in speech.
Think of 'addition' ('epenthesis') in speech when remembering that 'epenthetic' relates to adding sounds.