uncolourability means UK standard spelling of uncolorability. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From un- + colourability.
noun
- UK standard spelling of uncolorability.“We introduce weak oddness #92;omega#95;#123;#92;textrmw#125;, a new measure of uncolourability of cubic graphs, defined as the least number of odd components in an even factor.”