mono·ph·thongBrE /ˈmɒnəfθɒŋ/ 🔊, /ˈmɒnəθɒŋ/ 🔊NAmE /ˈmɑːnəfθɔːŋ/ 🔊, /ˈmɑːnəθɔːŋ/ 🔊 noun (phonetics 语音学) a speech sound that consists of only one vowel sound, for example the sound /uː/ in queue /kjuː/ 单元音 ➡ compare diphthong, triphthong ▸ mono·ph·thong·al BrE /ˌmɒnəfˈθɒŋɡl/ 🔊, /ˌmɒnəˈθɒŋɡl/ 🔊NAmE /ˌmɑːnəfˈθɔːŋɡl/ 🔊, /ˌmɑːnəˈθɔːŋɡl/ 🔊 adjective