Formal or literary term for a descendant, especially of a notable family or lineage. Often used in historical or genealogical contexts.
He claims to be a descendant of a famous warlord.
This family is said to be descended from the imperial line.
Compound of 後 (after, later) and 胤 (descendant, offspring). The kanji 胤 is relatively rare and typically appears in formal or historical terms related to lineage.