from
The Collaborative International Dictionary of English v.0.48
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]