noun
mortuary chapel; hall for memorial tablets
A building or hall within a temple or cemetery where 位牌 (memorial tablets) are enshrined and memorial services are held.
お寺の位牌堂で法要が行われた。
A memorial service was held in the temple's mortuary chapel.
納骨堂 is a columbarium for storing ashes, whereas 位牌堂 specifically houses memorial tablets.
Compound of 位牌 (ihai, 'memorial tablet') and 堂 (dō, 'hall'). The exact historical derivation is uncertain, but the term is conventionally used in Buddhist contexts.