/ Dictionary / Index S sib: Meaning and Definition of Find definitions for: sib Pronunciation: (sib), [key] — adj. related by blood; akin. —n. a kinsman; relative. one's kin or kindred. a unilateral descent group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sib (Thesaurus) Šiauliai Sibelius Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language