The Collaborative International Dictionary of English v.0.48:

Juice \Juice\ (j[=u]s), n. [OE. juse, F. jus broth, gravy,
   juice, L. jus; akin to Skr. y[=u]sha.]
   The characteristic fluid of any vegetable or animal
   substance; the sap or part which can be expressed from fruit,
   etc.; the fluid part which separates from meat in cooking.
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         An animal whose juices are unsound.      --Arbuthnot.
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         The juice of July flowers.               --B. Jonson.
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         The juice of Egypt's grape.              --Shak.
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         Letters which Edward Digby wrote in lemon juice.
                                                  --Macaulay.
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         Cold water draws the juice of meat.      --Mrs.
                                                  Whitney.
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The Collaborative International Dictionary of English v.0.48:

Juice \Juice\ (j[=u]s), v. t.
   To moisten; to wet. [Obs.] --Fuller.
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WordNet (r) 3.0 (2006):

juice
    n 1: the liquid part that can be extracted from plant or animal
         tissue by squeezing or cooking
    2: energetic vitality; "her creative juices were flowing"
    3: electric current; "when the wiring was finished they turned
       on the juice"
    4: any of several liquids of the body; "digestive juices" [syn:
       juice, succus]

The Jargon File (version 4.4.7, 29 Dec 2003):

juice
 n.

    The weight of a given node in some sort of graph (like a web of trust or a
    relevance-weighted search query). This appears to have been generalized
    from google juice, but may derive from black urban slang for power or a
    respect. Example: “I signed your key, but I really don't have the juice to
    be authoritative.”