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: Webster's Revised Unabridged Dictionary (1913)