/ Dictionary / Index F father-in-law: Meaning and Definition of Find definitions for: fa•ther-in-law Pronunciation: (fä'ur in lô"), [key] — pl. fa•thers-in-law. the father of one's husband or wife. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: father-in-law (Thesaurus) fatherhood fatherland Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language