/ Dictionary / Index F foster parent: Meaning and Definition of Find definitions for: fos'ter par'ent Pronunciation: [key] a foster father or foster mother. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. foster mother foster sister Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language