/ Dictionary / Index D diphenylacetylene: Meaning and Definition of Find definitions for: di•phen•yl•a•cet•y•lene Pronunciation: (dī-fen'l-u-set'l-ēn", -fēn'-), [key] — n. Chem. tolan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphenyl diphenylamine Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language