Dictionarydiph•thong•izePronunciation: (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.
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