- 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.
Compare rising diphthong.
Origin of falling diphthong
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018