The story
From Venus (after the resemblance of the leaves to a human vulva) + flytrap (after the insectivorous nature of the plant).
Etymology from Wiktionary, CC BY-SA 4.0.
Venus flytrap
Today it means: An insectivorous plant (Dionaea muscipula) of the savannas of North and South Carolina, with hinged leaves bordered with stiff hairs that close when an insect alights on them. Full definition →