Relating to, characterized by, or of the nature of a diphthong.
From 'diphthong' + '-ic' (having the quality of). This adjective form is an alternative to 'diphthongal,' commonly used in linguistic and phonetic terminology.
English textbooks might describe a sound as 'diphthongic' when they want to emphasize that it has the gliding, two-vowel quality that makes English pronunciation tricky for language learners!
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