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a point whose coordinates satisfy the equation of a curve although it does not lie on the curve; an isolated point. The origin is an acnode of the curve
C19: from Latin
a needle +
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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The centre is a conjugate point (or
) and the curve resembles fig. 4.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 4
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