Definition of "consanguineous"

consanguineous

/kɒnsaŋˈɡwɪni.əs/

adjective
not comparable
1. Related by birth; descended from the same parent or ancestor.
  Quotations
  Am not I consanguineous? am I not of her blood?
  c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)
  Consanguineous marriage is customary in many societies, but leads to an increased birth prevalence of infants with severe recessive disorders.
  2002, B. Modell and A. Darr, "Science and society: genetic counselling and customary consanguineous marriage," Nature Reviews: Genetics, vol 3. no. 3 (Mar.), p. 225