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[jey-nuh s] /ˈdʒeɪ nəs/

an ancient Roman god of doorways, of beginnings, and of the rising and setting of the sun, usually represented as having one head with two bearded faces back to back, looking in opposite directions.
Astronomy. a moon of the planet Saturn, located just outside the rings.
the Roman god of doorways, passages, and bridges. In art he is depicted with two heads facing opposite ways
a small inner satellite of Saturn

ancient Italic deity, guardian god of portals, doors, and gates; patron of beginnings and endings, c.1500, from Latin Ianus, literally “gate, arched passageway,” perhaps from PIE root *ei- “to go” (cf. Sanskrit yanah “path,” Old Church Slavonic jado “to travel”). He is shown as having two faces, one in front the other in back. His temple in Rome was closed only in times of peace.
Janus [(jay-nuhs)]

The Roman god of doors and gateways and hence of beginnings.

Note: Janus was pictured with two faces looking in opposite directions, one young and one old. Consequently, a hypocritical person is often called “Janus-faced.”

Note: The month of January is named after Janus.

1. Distributed language with an ask/tell constraint system.
qdjanus is a Janus-to-Prolog compiler for Sicstus Prolog and jc is compiles to C.
[“Janus: A Step Towards Distributed Constraint Programming”, V. Saraswat et al in Logic Programming: Proc 1990 North Am Conf, S. Debray et al eds, MIT Press 1990].
[“Programming in Janus”, Saraswat, Kahn, and Levy].
2. W.M. Waite, U Colorado. Intermediate language, claimed as an implementation of UNCOL. Used on CDC 6600.
[“Experience with the Universal Intermediate Language Janus”, B.K. Haddon et al, Soft Prac & Exp 8(5):601- 616 (Sep 1978)].


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  • Janus-cloth

    noun 1. a worsted fabric, each side of which has a different color.

  • Janus-faced

    [jey-nuh s-feyst] /ˈdʒeɪ nəsˌfeɪst/ adjective 1. having two faces, one looking forward, one looking backward, as the Roman deity Janus. 2. having two contrasting aspects, as the alternation of mood in a capricious person. 3. two-faced; deceitful. 4. aware of or concerned with polarities; seeing different and contrasting aspects: a Janus-faced view of history. 5. […]

  • Janus green b

    Janus green B Ja·nus green B (jā’nəs) n. A basic dye used as a histological stain.

  • Janus-word

    noun 1. a word that has opposite or nearly opposite meanings, as cleave, meaning ‘to adhere closely’ and ‘to part or split’. noun See contranym

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