/sib/ , adj.
1. related by blood; akin.
n.
2. a kinsman; relative.
3. one's kin or kindred.
4. Anthropol. a unilateral descent group.
[ bef. 900; ME sib ( e ), sibb ( e ), OE sib ( b ) (orig. adj.); c. ON sifjar (pl.) relatives, OFris sib (adj.), sibba (n.), MD sibbe (n. and adj.), G Sippe kin; cf. GOSSIP ]