diph·thong /ˈdɪfˌθɔŋ, ˈdɪp-/
雙重母音,雙母音字,連母音字
Diph·thong n. Orthoëpy (a) A coalition or union of two vowel sounds pronounced in one syllable; as, ou in out, oi in noise; -- called a proper diphthong. (b) A vowel digraph; a union of two vowels in the same syllable, only one of them being sounded; as, ai in rain, eo in people; -- called an improper diphthong.
Diph·thong, v. t. To form or pronounce as a diphthong; diphthongize. [R.]
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diphthong
n : a vowel sound that starts near the articulatory position for
one vowel and moves toward the position for another