The Collaborative International Dictionary of English v.0.48:

Nymphalidae \Nymphalidae\ prop. n.
   A natural family of large beautifully colored butterflies,
   called also the brush-footed butterflies; formerly called
   Nymphales.

   Syn: family Nymphalidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Nymphalidae
    n 1: large beautifully colored butterflies [syn: Nymphalidae,
         family Nymphalidae]