Describing a leaf that is completely divided to the midrib in a bipinnate pattern, with segments that are themselves divided to their midribs.
From 'bi-' (twice), 'pinnate,' and '-sect' (from Latin 'secare,' to cut). A maximum-division botanical term indicating complete separation.
If a leaf is bipinnatisect, it's basically 'fully carved in two directions'—botanists use this term when a leaf is so intricately divided that you can follow the cuts all the way to the center and see distinct, completely separate sections.
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