sibling

[sib-ling]
noun
1.
a brother or sister.
2.
Anthropology. a comember of a sib, a unilateral descent group thought to share kinship through a common ancestor.
adjective
3.
of or pertaining to a brother or sister: sibling rivalry.

Origin:
before 1000; late Middle English: relative, Old English; see sib, -ling1

half-sibling, noun
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Collins
World English Dictionary
sibling (ˈsɪblɪŋ)
 
n
1.  a.  a person's brother or sister
 b.  (as modifier): sibling rivalry
2.  any fellow member of a sib
 
[C19: specialized modern use of Old English sibling relative, from sib; see -ling1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sibling
"brother or sister," 1903, modern revival (in anthropology) of O.E. sibling "relative, kinsman," from sibb (adj.) "kinship, relationship" (1500; surviving as sib, chiefly in Scottish), from P.Gmc. *sebjo "blood relation, relative," prop. "one's own" (cf. O.S. sibba, O.Fris., M.Du. sibbe, O.H.G. sippa,
Ger. Sippe, Goth. sibja "kin, kindred"), from PIE s(w)e-bh(o)-, from base *swe- (see idiom). Related to the second element in gossip.
"The word 'sib' or 'sibling' is coming into use in genetics in the English-speaking world, as an equivalent of the convenient German term 'Geschwister' " [E.&C. Paul, "Human Heredity," 1930]
Short form sib is attested from 1957.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sibling sib·ling (sĭb'lĭng)
n.
One of two or more individuals having one or both parents in common; a brother or sister.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He and his siblings gathered in the upstairs bedroom of their house, avidly
  following their favorite serials.
One of my siblings is in quite a bit of financial stress.
Not all kids have siblings and they need to be around other kids.
The first sibling or two to mature sometimes eat their siblings in utero.
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