- a point at which two branches of a curve intersect, each branch having a distinct tangent; node
C19: cru- from Latin crux cross + node
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for crunode
In this case the centre is a crunode and the curve resembles fig. 5.