[1] : The Collaborative International Dictionary of English v.0.48

nightingale \night"ingale\, 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. naumktergal, 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.
      1913 webster

   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.
      1913 webster

   mock nightingale. zool. see blackcap, n., 1
      a .
          1913 webster
see also:
night yell luscinia megarhynchos luscinia luscinia lucinia philomela mock nightingale 
blackcap 

[2] : WordNet (r) 2.0

nightingale
     n 1: european songbird noted for its melodious nocturnal song
          syn: luscinia megarhynchos
     2: english nurse remembered for her work during the crimean war
        1820-1910 syn: florence nightingale, the lady with
        the lamp
see also:
luscinia megarhynchos florence nightingale the lady with the lamp 

Nightingale >> N Words
Nightingale, definition of term: Nightingale
nightingale_pag1.html