A mathematical point on a curve where the tangent line touches the curve in two distinct points.
From Latin 'bi-' (two) plus 'flectus' (bent or curved) plus 'nodus' (knot or node). This is a technical term from algebraic geometry and higher mathematics.
A biflecnode is one of those mathematical objects that sounds impossible—a single point where two different touches happen—and it shows up in real equations, proving that math is stranger than it seems!
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