複元音

复元音
fùyuányīn
  1. (phonetics) compound vowel
  2. compound vowel

Wiktionary

Entry Composition

1 複 fù
  1. to repeat
  2. to double
  3. to overlap
  4. complex (not simple)
  5. compound
  6. composite
  7. double
  8. diplo-
  9. duplicate
  10. overlapping
  11. to duplicate
2 元音 yuányīn vowel