The Collaborative International Dictionary of English v.0.48:

Gracilariidae \Gracilariidae\ prop. n.
   A natural family of moths, the larvae of which are one type
   of leaf miner.

   Syn: Gracillariidae, family Gracilariidae.
        [WordNet 1.5] Gracile

WordNet (r) 3.0 (2006):

Gracilariidae
    n 1: leaf miners [syn: Gracilariidae, Gracillariidae,
         family Gracilariidae]