'Janus' definitions:

Definition of 'Janus'

From: WordNet
noun
(Roman mythology) the Roman god of doorways and passages; is depicted with two faces on opposite sides of his head

Definition of 'Janus'

From: GCIDE
  • Janus \Ja"nus\, n. [L. See January.] (Rom. Antiq.) A Latin deity represented with two faces looking in opposite directions. Numa is said to have dedicated to Janus the covered passage at Rome, near the Forum, which is usually called the Temple of Janus. This passage was open in war and closed in peace. --Dr. W. Smith. [1913 Webster]
  • Janus cloth, a fabric having both sides dressed, the sides being of different colors, -- used for reversible garments. [1913 Webster]