A type of plant root system or a plant with a specific root structure, though this term is quite rare and possibly archaic.
Compound of 'fit' (suitable, fitting) and 'root,' possibly referring to roots that fit together or a root system with ideal structure. The term appears to be obsolete or highly specialized botanical vocabulary.
This word is so obscure that even most botanical dictionaries don't include it—it's a perfect example of how English used to be packed with specific terms for plant parts that modern speakers have completely forgotten.
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