血けつ胤いんMeanings1nounlineage; bloodline; descentrare termRare, formal term for blood relationship or ancestry. More common synonyms include 血筋 (ちすじ) and 血統 (けっとう).See also: 血筋彼かれは高こう貴きな血けつ胤いんを誇ほこりにしている。He takes pride in his noble lineage.