/ Dictionary / Index P posttonic: Meaning and Definition of Find definitions for: post•ton•ic Pronunciation: (pōst-ton'ik), [key] — adj. immediately following a stressed syllable: a posttonic syllable; a posttonic vowel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. post time posttranscriptional Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language