A plant whose name suggests it was believed to help treat clotted blood or wounds, though the specific plant is historically unclear.
Compound of 'clot' and 'weed' (from Old English 'weod'), reflecting medieval naming conventions where plants were named for their supposed medicinal properties. The exact botanical identity is lost to history.
Medieval people named plants based on what they *looked* like they should do—if it was red or stringy, it must be for blood; if it grew in bunches, it must be for lumps! This is why so many old plant names are hilariously wrong about what they actually do.
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