triclinium

A couch facing three sides of a rectangular table, used by the ancient Greeks, Etruscans, and Romans for reclining at meals.

A room containing such a couch or couches; a dining room.

Among the Romans, the dining-room where guests were received, furnished with three couches, which occupied three sides of the dinner-table, the fourth side being left open for the free ingress and egress of servants.

A couch for reclining at meals, extending round three sides of a table, and usually in three parts.

A dining room furnished with such a triple couch.

A couch for reclining at mealtimes, extending round three sides of a table, and usually in three parts.

A dining room furnished with such a triple couch.

a dining room (especially a dining room containing a dining table with couches along three sides)

a dining table with couches along three sides in ancient Rome