A plant (such as a buttercup or fig marigold) that causes blisters on the skin upon contact, or a folk name for various irritating plants.
Compound of 'blister' plus 'weed,' using traditional plant-naming convention where plants are named after their effects on people.
Plants with names like 'blisterweed' are nature's original warning labels—before humans could read, the scary name literally helped people remember which plants to avoid touching.
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