In botany, a leaf or leaflet structure that is divided into three parts twice, creating nine smaller segments.
From bi- (two) + ternate (from Latin ternarius, 'consisting of three'). This botanical term combines the Latin prefix for 'two' with the Latin root for 'three' to describe a specific leaf arrangement.
If you see a biternate leaf, count the leaflets and you'll find nine arranged in groups of three—it's like nature's way of doing multiplication with leaves, and botanists needed one word to describe this exact pattern.
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