'Triclinium' definitions:

Definition of 'triclinium'

(from WordNet)
noun
A dining room (especially a dining room containing a dining table with couches along three sides)
noun
A dining table with couches along three sides in ancient Rome

Definition of 'Triclinium'

From: GCIDE
  • 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]