In mathematics, relating to a curve that has an acnode (an isolated point where the curve touches itself but does not cross).
From 'acnode,' a mathematical term combining 'a-' (from Greek, meaning 'not') and Latin 'nodus' (meaning 'knot'). An acnode is literally a point that looks knotted but isn't—it's a singularity in algebraic curves.
An acnode is one of math's coolest visual tricks—it's a point on a curve where the curve perfectly touches itself at a single point with no crossing, creating an isolated 'kissing point' that looks magical when you graph it!
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