| 1. | any 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 (woolly apple aphid or American blight) and Prociphilus tessellatus (woolly alder aphid). |
| 2. | any of various aphids that produce white waxy threads, as Adelges piceae (balsam woolly aphid). |
