Denshi Jisho — Online Japanese dictionary

血縁 けつえん blood relative or relationship; consanguinity
Common word, Noun, No-adjective 
血縁淘汰 けつえんとうた kin selection
Noun 
血縁関係 けつえんかんけい blood relationship; blood relations; being genetically related
Noun, No-adjective 
血縁集団 けつえんしゅうだん consanguineous group; kin group
Noun 

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