/ Dictionary / Index P pacifier: Meaning and Definition of Find definitions for: pac•i•fi•er Pronunciation: (pas'u-fī"ur), [key] a person or thing that pacifies. a rubber or plastic device, often shaped into a nipple, for a baby to suck or bite on. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pacifier (Thesaurus) Pacific tree frog pacifism Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language