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Relating or belonging to a diphthong; having the nature of a diphthong. -- Diph*thon"gal*ly, adv.

To make into a diphthong; to pronounce as a diphthong.

Of the nature of diphthong; diphthongal. H. Sweet.

nt or consonant to vowel in a syllable, or from one component to the other of a double or diphthongal consonant (see Guide to Pronunciation, §§ 19, 161, 162). Also (by Bell and others), the vanish (or brief final element) or the brief initial element, in a class of diphthongal vowels, or the brief final or initial part…