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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Any moth whose caterpillar stage is a silkworm, especially Bombyx mori, the domestic silkmoth, but also others in the families Bombycidae and Saturniidae (as well as the Siberian silkmoth in the family Lasiocampidae). Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.