Dictionary
diph•thong•ize
Pronunciation: (dif'thông-īz", -gīz", -thong-, dip'-), [key]
—v., -ized, -iz•ing.
Phonet.
—
v.t.
to change into or pronounce as a diphthong.
—
v.i.
to become a diphthong.
Also, esp. Brit.,diph'thong•ise".Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.