sib Meaning, Definition & Usage

  1. noun a person's brother or sister
    sibling.
  2. noun one related by blood or origin; especially on sharing an ancestor with another
    blood relative; cognate; blood relation.

WordNet

Sib noun
Etymology
AS. sibb alliance, gesib a relative. See Gossip.
Definitions
  1. A blood relation. Obs. Nash.
Sib adjective
Definitions
  1. Related by blood; akin. Obs. or Prov. Eng. & Scot. Sir W. Scott.
    Your kindred is but . . . little sib to you. Chaucer.
    [He] is no fairy birn, ne sib at all To elfs, but sprung of seed terrestrial. Spenser.

Webster 1913