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
英汉双解大词典
triclinium/traɪˈklɪnɪəm/
1.
N（名词）
in ancient Rome an arrangement of three couches around a table for reclining upon while dining (古罗马)环绕餐桌的三躺椅布局