falling diphthong

noun Phonetics.
  1. a diphthong in which the first of the two apparent vocalic elements is of greater stress or sonority and the second is of lesser stress or sonority, as in (ī), (ou), (oi), etc.

Origin of falling diphthong

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018