A curve or line that intersects another curve at exactly two points.
From duo- (Latin 'two') + secant (from Latin secare meaning 'to cut'). A secant line cuts a curve; a duosecant specifically cuts in two places.
In geometry, a duosecant is the bridge between a secant (which could hit anywhere) and a tangent (which touches at one point)—it's the sweet spot where you're definitely hitting the curve twice, which matters a lot in calculus.
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