What was the Roman term for a dining couch?

The Roman term for a dining couch is "lectus." In ancient Rome, the lectus was specifically designed for reclining during meals, a practice that was common among the Romans during their elaborate dining experiences. This design allowed diners to eat more comfortably while lying on their sides, often supported by cushions. The lectus was a central piece in the Roman dining room, reflecting both the social customs and the importance of hospitality in Roman culture.

The other terms listed have different meanings: "inesis" does not relate to a dining arrangement, "mensa" refers to a table, which is where food would be placed, and "tabula" essentially means a board or table and is not specific to the type of lounging furniture used for dining. Thus, the clear connection of "lectus" to the dining practices of Romans solidifies it as the correct answer in this context.