/ Dictionary / Index P Pfund series: Meaning and Definition of Find definitions for: Pfund' se"ries Pronunciation: (fund, pfoond), [key] — Spectroscopy. Spectroscopy. a series of lines in the infrared spectrum of hydrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pfui PG Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language