/ Dictionary / Index S son-in-law: Meaning and Definition of Find definitions for: son-in-law Pronunciation: (sun'in-lô"), [key] — pl. sons-in-law. the husband of one's daughter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: son-in-law (Thesaurus) soniferous sonnet Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language