Definition of cobalt violet
1
: any of several purple pigments containing a compound of cobalt (as cobalt phosphate)
2
: a moderate purple that is redder and duller than heliotrope (see heliotrope 4a), redder, lighter, and stronger than average amethyst, redder and less strong than manganese violet, redder and deeper than average lilac (see lilac 3a), and redder and stronger than mignon — called also
thistle
