/ Dictionary / Index P pollen sac: Meaning and Definition of Find definitions for: pol'len sac" Pronunciation: [key] — Bot. Bot. one of the cavities in an anther in which pollen is produced. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pollenosis pollen tube Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language