Definition of Janus-like:
(n) :
(Roman mythology) The god of doorways, gates and transitions, and of beginnings and endings, having two faces looking in opposite directions.
(n) :
(figuratively) A two-faced person, a hypocrite.
(n) :
(attributively) Used to indicate things with two faces (such as animals with diprosopus) or aspects; or made of two different materials; or having a two-way action.
(n) :
A moon of Saturn.
(n) :
(chemistry, attributively) Used to indicate an azo dye with a quaternary ammonium group, frequently with the diazo component being safranine.