noun
joint enshrinement; shrine building for multiple deities
Shinto term for enshrining two or more deities together in one shrine building, or the building itself. The reading あいでん is less common.
この神社では、主祭神のほかに相殿に三柱の神が祀られている。
At this shrine, in addition to the main deity, three other deities are enshrined in the joint enshrinement hall.
相殿は複数の神を一つの社殿に合祀する形式です。
Aidono is a style of enshrining multiple deities together in one shrine building.
合祀 refers to the act of enshrining together, while 相殿 can refer to the building or the state of joint enshrinement.
Compound of 相 (ai, 'together') and 殿 (den/dono, 'hall, building'). The reading あいどの is more common than あいでん.