lacewingEnglishOxford New American Dictionarylacewing /ˈlāsˌwiNG, ˈleɪsˌwɪŋ / ▸ noun a slender delicate insect with large clear membranous wings. Both the adults and larvae are typically predators of aphids. Several families in the order Neuroptera, in particular Chrysopidae (the green lacewings).