/ Dictionary / Index P plethysmogram: Meaning and Definition of Find definitions for: ple•thys•mo•gram Pronunciation: (plu-thiz'mu-gram"), [key] — n. the recording of a plethysmograph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plethoric plethysmograph Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language