/ Dictionary / Index R rising diphthong: Meaning and Definition of Find definitions for: ris'ing diph'thong Pronunciation: (gwä'vu). [key] — Phonet. Phonet. a diphthong in which the first of two apparent vocalic elements is of lesser stress or sonority than the second, as the (wä) in guavaCf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rising action rising hinge Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language