Source : Webster's Revised Unabridged Dictionary (1913)

Lacewing \Lace"wing`\, n. (Zo["o]l.)
   Any one of several species of neuropterous insects of the
   genus {Chrysopa} and allied genera. They have delicate,
   lacelike wings and brilliant eyes. Their larv[ae] are useful
   in destroying aphids. Called also {lace-winged fly}, and
   {goldeneyed fly}.

Source : WordNet®

lacewing
     n : any of two families of gauzy-winged insects (Chrysopidae and
         Hemerobiidae); larvae feed on insect pests such as aphids
         [syn: {lacewing fly}]