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pinnule
This term is a specialized botanical descriptor used primarily in the study of pteridology and plant morphology. It describes the finest level of division in bipinnate or tripinnate leaves, where the pinnule serves as the ultimate segment of the leaf structure. It is distinct from a pinna, which is the primary division of the frond.
Because it is a technical scientific term, it is rarely encountered outside of academic botany, field guides, or taxonomic descriptions. It carries a neutral, descriptive tone and is used to provide precise anatomical detail regarding the complexity of a leaf's branching pattern.