(κορον, Lat. chorus), that part of a church or cathedral where choristers sing divine service. It is separated from the chancel, and also from the nave. The choir was separated from the nave in the time of Constantine, and in the twelfth century it was inclosed with walls; but the ancient balustrades have been since restored. The choir in nunneries is a large hall separated by a grate from the body of the church, where the nuns chant the service. Choir is also used to denote a band of singers in any church.

CHOISY-SUR-Seine, or Choisy le Roi, a town of France, on the left bank of the Seine, 6 miles S.E. of Paris. Pop. 4000. It is a pleasantly situated and thriving manufacturing town, producing glass and china wares, morocco leather, soap, and chemicals.