The Collaborative International Dictionary of English v.0.48:

Consanguinity \Con`san*guin"i*ty\, n. [L. consanguinitas: cf. F.
   consanguintit['e].]
   The relation of persons by blood, in distinction from
   affinity or relation by marriage; blood relationship; as,
   lineal consanguinity; collateral consanguinity.
   [1913 Webster]

         Invoking aid by the ties of consanguinity. --Prescott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

consanguinity
    n 1: (anthropology) related by blood [syn: consanguinity,
         blood kinship, cognation] [ant: affinity]