Etymology
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sib (n.)

short for sibling, attested from 1957.

updated on September 02, 2012

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Definitions of sib from WordNet

sib (n.)
a person's brother or sister;
Synonyms: sibling
sib (n.)
one related by blood or origin; especially on sharing an ancestor with another;
Synonyms: blood relation / blood relative / cognate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.