A plant or herb that grows in boggy terrain, possibly a historical or regional name for bog-dwelling vegetation.
Compound of bog + wort (Old English 'wyrt' meaning plant or herb), a common pattern in English plant naming (see mugwort, spiderwort, etc.).
The suffix '-wort' appears in hundreds of plant names, and each one tells you where the plant grows—bogwort literally announces 'I'm a bog plant!'—it's how medieval herbalists organized their botanical knowledge!
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