'Janus like' definitions:
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ambidextrous,
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bifacial,
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bifold,
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biform,
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bilateral,
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binary,
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binate,
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biparous,
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bivalent,
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conduplicate,
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disomatous,
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double,
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double-faced,
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dual,
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duple,
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duplex,
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duplicate,
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geminate,
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geminated,
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second,
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secondary,
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twin,
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twinned,
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two-faced,
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two-level,
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two-ply,
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two-sided,
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two-story,
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twofold