A relative by blood, especially one related through the mother's side; a blood relative.
Direct Latin term meaning 'born together' or 'related,' from cum- (with) and gnatus (born). The word was used in Roman law to indicate kinship relationships and entered English largely through legal and genealogical texts.
This Latin term is still used in genealogy and law because it carries precise meaning—it instantly tells you someone is a blood relative rather than someone related only by marriage.
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