A family-level taxonomic classification in historical botanical nomenclature for dicotyledonous plants.
From 'dicotyledon' + Latin '-idae' (family suffix used in taxonomy). This represents an earlier attempt to organize plants systematically at the family level.
This is a 'ghost' word from older botanical systems—scientists have mostly stopped using it because modern DNA analysis has revealed plant families don't group the way these old naming systems suggested!
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