A general term for a Buddhist temple. Often used in formal or written contexts; in everyday speech, お寺 (おてら) is more common.
この町には古い仏寺がいくつかある。
There are several old Buddhist temples in this town.
Nenbutsu temple
Compound of 仏 (ぶつ, 'Buddha') and 寺 (じ, 'temple'). The reading ぶつじ is the on'yomi of both characters.