Webster's English Dictionary

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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