The Collaborative International Dictionary of English v.0.48:

Nightingale \Night"in*gale\, n. [OE. nihtegale,nightingale, AS.
   nihtegale; niht night + galan to sing, akin to E. yell; cf.
   D. nachtegaal, OS. nahtigala, OHG. nahtigala, G. nachtigall,
   Sw. n[aum]ktergal, Dan. nattergal. See Night, and Yell.]
   1. (Zool.) A small, plain, brown and gray European song bird
      (Luscinia megarhynchos syn. Luscinia luscinia). It
      sings at night, and is celebrated for the sweetness of its
      song.
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   2. (Zool.) A larger species (Lucinia philomela), of Eastern
      Europe, having similar habits; the thrush nightingale. The
      name is also applied to other allied species.
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   Mock nightingale. (Zool.) See Blackcap, n., 1
      (a) .
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The Collaborative International Dictionary of English v.0.48:

Mock \Mock\, a.
   Imitating reality, but not real; false; counterfeit; assumed;
   sham.
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         That superior greatness and mock majesty. --Spectator.
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   Mock bishop's weed (Bot.), a genus of slender umbelliferous
      herbs (Discopleura) growing in wet places.

   Mock heroic, burlesquing the heroic; as, a mock heroic
      poem.

   Mock lead. See Blende (
   a ).

   Mock nightingale (Zool.), the European blackcap.

   Mock orange (Bot.), a genus of American and Asiatic shrubs
      (Philadelphus), with showy white flowers in panicled
      cymes. Philadelphus coronarius, from Asia, has fragrant
      flowers; the American kinds are nearly scentless.

   Mock sun. See Parhelion.

   Mock turtle soup, a soup made of calf's head, veal, or
      other meat, and condiments, in imitation of green turtle
      soup.

   Mock velvet, a fabric made in imitation of velvet. See
      Mockado.
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