In botany, describing a compound leaf or frond that is twice divided in a pinnate (feather-like) pattern, with the divisions themselves being triply pinnate.
From 'bi-' (two), 'tri-' (three), 'pinnate' (feather-shaped, from Latin 'pinna' meaning feather), and 'fid' (cleft). This is highly technical botanical terminology that emerged as botanists needed precise descriptors.
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