proseuchai

All communities had their synagogue, proseuchai or sabbateia, which served also as libraries and places of assembly.

The Catholic Encyclopedia, Volume 4: Clandestinity-Diocesan Chancery 1840-1916 1913

Their conventicles were called, not churches, but "prayer-houses" (proseuchai).

The Catholic Encyclopedia, Volume 11: New Mexico-Philip 1840-1916 1913

The extent to which this diaspora was helpful in the diffusion of Christianity, the manner in which the mission of the apostles everywhere attached itself to the synagogues and proseuchai, is well known from the New Testament.

Prolegomena Julius Wellhausen 1881