triclinium

noun2

1. •
   A couch for reclining at mealtimes, extending round three sides of a table, and usually in three parts.

   • Seated on the triclinium in the midst is a middle-aged man, with a high and noble brow; the fine aquiline nose, so patrician, as if their eagle had set his own seal on his warlike race;... — 1831
2. •
   A dining room furnished with such a triple couch.

   • The manor house seemed still as the night itself. Morgan la Blanche had taken herself to a couch in the triclinium, choosing it rather than one of the cubicles leading from the atrium. — 1903