acnode
noun
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 y ² + x ² = x ³
Word Origin for acnode
C19: from Latin acus a needle + node
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for acnode
Historical Examples of acnode
The centre is a conjugate point (or acnode) and the curve resembles fig. 4.