The Collaborative International Dictionary of English v.0.48:

Consanguineous \Con`san*guin"e*ous\, a. [L. conguineus; con- +
   sanguis blood: cf. F. consanguin. See Sanquine.]
   Of the same blood; related by birth; descended from the same
   parent or ancestor. --Shak.

   Syn: consanguine. [1913 Webster]

WordNet (r) 3.0 (2006):

consanguineous
    adj 1: related by blood [syn: akin(p), blood-related,
           cognate, consanguine, consanguineous,
           consanguineal, kin(p)]