A botanical term describing a compound leaf that has exactly two leaflets attached to a single petiole or stem.
From Latin 'bi-' (two) + 'foliolate' (having small leaves). This technical botanical term became standardized in the 18th century as scientists needed precise language to classify plant structures.
Peanut plants are bifoliolate, which seems humble until you realize this leaf structure directly relates to how the plant captures energy and supports its famous underground pods.
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