A small branch or twig of a plant traditionally used to treat or reduce fever.
From 'fever' plus 'twig,' a compound noun following the pattern of herbal folk medicine naming. The '-twig' specification suggests the plant material was gathered in thin branches rather than roots or whole plants.
The specificity of 'fevertwig' (versus 'feverroot' or 'feverweed') suggests different preparation methods and plant parts—it's like how modern recipes specify 'fresh basil leaves' versus 'dried basil seeds.' Folk knowledge was surprisingly precise!
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