sib
1. sib \'sib\ aj [ME, fr. OE sibb, fr. sibb kinship; akin to OHG sippa kinship], family, L suus one's own - more at SUICIDE : related by blood : AKIN 2. sib n 1a: KINDRED, RELATIVES 1b: a blood relation : KINSMAN 2: a brother or sister considered irrespective of sex; broadly : an y plant or animal of a group sharing a corresponding degree of relation 3: a group of persons unilaterally descended from a real or supposed ancest or