any of several insects of the family Chrysopidae, having delicate, lacelike wings and golden or copper-colored eyes, the larvae of which are predaceous on aphids and other small insects.

1850–55; lace + wing Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lacewing (ˈleɪsˌwɪŋ)
any of various neuropterous insects, esp any of the families Chrysopidae (green lacewings) and Hemerobiidae (brown lacewings), having lacy wings and preying on aphids and similar pests

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Attraction of two lacewing species to volatiles produced by host plants and aphid prey.
Predaceous lacewing attacking pickleworm caterpillar.
Effects of reduced rates of two insecticides on enzyme activity and mortality of an aphid and its lacewing predator.
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