A plant or herb believed in folklore to cause blindness or eye problems, or a plant with small inconspicuous flowers that are hard to see.
Compound of 'blind' (lacking sight) plus 'weed' (an unwanted plant). Folk terminology naming plants after their believed effects or appearance.
Medieval herbalists used frightening plant names like 'blindweed' to warn people away from poisonous plants—it was their way of creating natural danger labels before we had warning signs.
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