GNU Collaborative International Dictionary of English

Found one definition

1.       
   Nightingale , 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. näktergal, Dan. nattergal. See Night, and Yell.]
   (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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   (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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