/ Dictionary / Index P pustulation: Meaning and Definition of Find definitions for: pus•tu•la•tion Pronunciation: (pus"chu-lā'shun), [key] — n. the formation or breaking out of pustules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pustulate pustule 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