[1] : The Collaborative International Dictionary of English v.0.48

sibling \sib"ling\ sub + -ling. si^b"li^ng, n.
   a brother or a sister.

   note: siblings have at least one parent in common. those
         related only by a common mother are uterine siblings;
         those related only by a common father are agnate
         siblings or consanguine siblings a legal term. a
         sibling having both parents in common is a
         sibling-german or a full brother or full sister.
         these modifying terms are more commonly used for the
         more specific uterine brother, uterine sister,
         agnate brother, brother-german, etc.
         pjc
see also:
uterine siblings agnate siblings consanguine siblings sibling-german full brother full sister 
uterine brother uterine sister agnate brother brother-german 

Sister >> S Words
Sister, definition of term: Sister
sister_pag1.html

Uterine >> U Words
Uterine, definition of term: Uterine
uterine_pag1.html

Sister Ship >> S Words
Sister Ship, definition of term: Sister Ship
sister+ship_pag1.html

Half Sister >> H Words
Half Sister, definition of term: Half Sister
half+sister_pag1.html

Sob Sister >> S Words
Sob Sister, definition of term: Sob Sister
sob+sister_pag1.html