A graph vertex in a graph is said to be an odd node if its vertex degree is odd.
Odd Vertex
See also
Even Vertex, Graph, Graph Vertex, Odd Graph, Vertex DegreeExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Odd Vertex." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OddVertex.html