Iānus ī, m IA-, an old Italian deity, good of doors, passages, and entrances, of all beginnings, and of the month of January: anceps, with two faces, O.: bifrons, V.: Ianus Quirini, H.

—The temple of Janus: ad infimum Argiletum, L.

—An arched passage-way, covered passage, arcade: transitiones perviae Iani nominantur: dexter Ianus portae, Cs.

—Esp., four arched passages in the Forum, the exchange for merchants and bankers: medius: summus, H.