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Use "diphthongal" in a sentence
"Darya Kavitskaya in Compensatory Lengthening: Phonetics, Phonology, Diachrony (2002) relates her own story about perceptual metathesis on page 48 in footnote 8: "Indeed, in teaching Russian to American students, I noticed many instances of palatalization of the consonant being heard as some kind of diphthongal property of the preceding vowel, for example, [banʲa] 'bath' was misheard and pronounced as [baʲnʲa] or even [bajna]." (link here)."
"The distinctions might not be easy to find, but these 'higher order' signs are generally assumed to be either different diphthongal versions, or those with an aspirated consonant."
"“New York tawk features a diphthongal aw sound,” Elster observes, “that in heavy New Yorkese sounds almost disyllabic.”"