What does consanguineous mean?
Consanguineous is a formal adjective describing individuals who are related by blood — that is, descended from a shared ancestor. It derives from the Latin words for 'together' (com-) and 'blood' (sanguis), so it literally means 'of the same blood'. The term appears most often in genetics, medicine, anthropology, and law, where precision about biological relationships matters: for example, researchers study the effects of consanguineous marriage on the likelihood that offspring will inherit recessive genetic conditions, and legal systems may use degrees of consanguinity to determine inheritance rights. Although it carries no inherent judgement, its clinical tone can feel impersonal compared with everyday terms such as 'blood relative' or simply 'related'. For anyone reading medical literature, genealogical research, or legal documents, understanding consanguineous is essential, since it signals a precise, measurable degree of biological kinship rather than a loose family connection.
adjectiveOf or relating to people descended from the same ancestor; closely related by blood.
- Related by descent from a common ancestor; sharing a bloodline, especially to a degree relevant to genetics or law.
"Marriage between consanguineous relatives carries a higher risk of inherited genetic disorders."
"Consanguineous marriages are more common in some communities than others, and genetic counselling is often advised."
"The inheritance claim was complicated because several of the claimants were consanguineous relatives of the deceased."
The word 'consanguineous' literally means 'same blood' — it comes from the Latin con- (together) + sanguis (blood), making it a formal way of saying you share blood with someone.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of consanguineous
Consanguineous derives from the Latin consanguineus, formed from com- ('together, same') and sanguineus ('of blood'), itself from sanguis ('blood'). The word entered English in the early 17th century, largely through legal and ecclesiastical usage concerning degrees of kinship within prohibited marriages. Its sibling noun, consanguinity, has been used even longer in English to denote blood relationship as a legal category, while other English derivatives of sanguis include sanguine and sanguinary.
Related word forms
How consanguineous is actually used
A formal term used chiefly in genetics, medicine, anthropology, and legal contexts. In everyday speech, phrases like 'related by blood' or 'blood relative' are more common.
Easily confused with consanguineous
Congenial means pleasant and agreeable in temperament, while consanguineous means related by blood.