Hypertext Webster Gateway: "diphthongize"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Diphthongize \Diph"thong*ize\, v. t. & i.
To change into a diphthong, as by affixing another vowel to a
simple vowel. ``The diphthongized long vowels.'' --H. Sweet.
From WordNet (r) 1.7 (wn)
diphthongize
v : change from a simple vowel to a diphthong; "This vowel
diphthongized in Germanic"
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