Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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
     [also: {triclinia} (pl)]

triclinia
     See {triclinium}