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WordReference Random House Unabridged Dictionary of American English © 2024wool′ly a′phid, - Insectsany plant louse of the family Aphididae, characterized by a waxy secretion that appears like a jumbled mass of fine, curly, white cottony or woolly threads, as Eriosoma lanigerum (wool′ly ap′ple a′phid or American blight) and Prociphilus tessellatus (wool′ly al′der a′phid.)
- Insectsany of various aphids that produce white waxy threads, as Adelges piceae (balsam woolly aphid).
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