Vowelize comes from vowel (from Old French vouel, from Latin vocalis 'vocal, sounding', from vox 'voice') plus the verb-forming suffix -ize. In current use it is a verb meaning "to add vowel points or marks to a consonantal text, or to make a sound vocalic". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The surface form is compositional: its joined elements remain visible in the modern word. The historical chain includes Latin vocalis and Latin vox. Related English forms include vowel, vocalize, and vocalic. Derived forms include vowelization and vowelizer. The word's history is thus visible in its construction: the components remain interpretable even after the whole expression has settled into a conventional English meaning.