VOWELIZE
vocalize, vocalise, vowelize, vowelise
(verb) pronounce as a vowel; “between two consonants, this liquid is vowelized”
Source: WordNet® 3.1
Etymology
Verb
vowelize (third-person singular simple present vowelizes, present participle vowelizing, simple past and past participle vowelized)
(transitive) To give the quality, sound, or office of a vowel to.
(transitive) To insert a vowel or vowels into.
Source: Wiktionary
Vow"el*ize, v. t.
Definition: To give the quality, sound, or office of a vowel to.
Source: Webster’s Unabridged Dictionary 1913 Edition