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Janus, in Roman mythology, guardian of gateways and doors and god of beginnings. The first hour of each day and first day of each month was holy to him. January is named for him, and many Roman doorways and arches bear his image: a double-faced head looking in 2 directions.

See also: Mythology.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Inert gas to Jaruzelski, Wojciech