"Janus : (Roman mythology) The god of doorways, gates and transitions, and of beginnings and endings,..."
(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.
(chemistry, attributively) Used to indicate an azo dye with a quaternary ammonium group, frequently with the diazo component being safranine.
(figuratively) A two-faced person, a hypocrite.
(astronomy) A moon of Saturn.
The word January is from a Latin word meaning “month of Janus”. Happy New Year from all of us at the English Wiktionary!”
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