10 letters · 15 points in Scrabble
noun the insertion of a vowel or consonant into a word to make its pronunciation easier
originMiddle of 16th century: via Late Latin, from Ancient Greek ἐπένθεσις (epénthesis), from ἐπεντίθημι (epentíthēmi, “to insert”), from ἐπί (epí) + ἐντίθημι (entíthēmi, “to put in”), from ἐν (en, “in”) + τίθημι (títhēmi, “to put, place”).
Etymology from Wiktionary, CC BY-SA 3.0