The Collaborative International Dictionary of English v.0.48:

Inside \In"side`\, n.
   1. The part within; interior or internal portion; content.
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            Looked he o' the inside of the paper? --Shak.
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   2. pl. The inward parts; entrails; bowels; hence, that which
      is within; private thoughts and feelings.
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            Here's none but friends; we may speak
            Our insides freely.                   --Massinger.
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   3. An inside passenger of a coach or carriage, as
      distinguished from one upon the outside. [Colloq. Eng.]
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            So down thy hill, romantic Ashbourne, glides
            The Derby dilly, carrying three insides.
                                                  --Anti-Jacobin.
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   Patent insides or Patent outsides, a name give to
      newspaper sheets printed on one side with general and
      miscellaneous matter, and furnished wholesale to offices
      of small newspapers, where the blank pages are filled up
      with recent and local news.
      [1913 Webster]