reclinatorium
From LSJ
rē̆clīnātōrĭum: i, n. reclino; in <number opt="n">plur.</number>,
I the back of a couch: reclinatoria vulgus appellat ornamenta lectorum, quae fulciunt toros sive caput, Isid. Orig. 19, 26, 3. —
II The seat in a chariot: aureum, Vulg. Cant. 3, 10.