genus Hyphantria
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| Noun | 1. |  genus Hyphantria - fall webworms arthropod genus - a genus of arthropods family Lasiocampidae, Lasiocampidae - tent caterpillars; eggars; lappet moths Hyphantria cunea - moth whose larvae are fall webworms fall webworm, Hyphantria cunea - a variety of webworm |