ancestral shrine; mausoleum
Refers to a shrine or mausoleum dedicated to ancestors, often used in historical, Confucian, or imperial contexts. The Imperial mausoleum sense is a specific application.
An ancestral shrine is an important facility for honoring one's ancestors.
The imperial mausoleum for successive emperors is in Kyoto.
From Chinese 宗廟 (zōngmiào), composed of 宗 (ancestral, clan) and 廟 (shrine, mausoleum). The term was adopted into Japanese with the same meaning, primarily used in historical and imperial contexts.