Triclinium

from WordNet (r) 3.0 (2006)

triclinium
    n 1: a dining room (especially a dining room containing a dining
         table with couches along three sides)
    2: a dining table with couches along three sides in ancient Rome

from The Collaborative International Dictionary of English v.0.48

Triclinium \Tri*clin"i*um\, n.; pl. {Triclinia}. [L., from Gr.
   ?, ?; ? (see {Tri-}) + {?} a couch.] (Rom. Antiq.)
   (a) A couch for reclining at meals, extending round three
       sides of a table, and usually in three parts.
   (b) A dining room furnished with such a triple couch.
       [1913 Webster]