Definition of "diphthongal" []

• Pertaining to a diphthong. (adjective)

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• "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.”"