The root system of a broom plant, or a plant with roots resembling broom characteristics.
From broom + root (Old English 'wyrt', plant). Compound describing the root structure of broom plants.
Plant roots were often named by their appearance or the plants they came from, and 'broomroot' is one of those descriptive names that tells you exactly what plant's roots you're looking at—a naming system used long before scientific Latin names.
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