A variant or alternative form of consanguineal; relating to bloodline and kinship.
From 'consanguine' with the suffix '-ean' (an alternative to '-al' for forming adjectives); this is a less common variant in formal English.
The existence of both 'consanguineal' and 'consanguinean' shows how English loves synonymous variants—you get the same meaning but with slightly different endings, and scholars would probably argue about which one is 'correct'!
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