Definitions of lacewing

  1. any of two families of gauzy- winged insects ( Chrysopidae and Hemerobiidae); larvae feed on insect pests such as aphids
  2. Any one of several species of neuropterous insects of the genus Chrysopa and allied genera. They have delicate, lacelike wings and brilliant eyes. Their larvae are useful in destroying aphids. Called also lace- winged fly, and goldeneyed fly.