cobalt  
 noun [ U ] uk/ˈkəʊ.bɒlt/ us/ˈkoʊ.bɑːlt/ (symbol Co)
  (METAL)     
  钴
a chemical element that is a hard silver-white metal, used in metal mixtures and for making materials blue
   (COLOUR)     
 (also cobalt blue)钴类颜料 
a deep blue or greenish-blue colour
 cobalt      
adjective uk/ˈkəʊ.bɒlt/ us/ˈkoʊ.bɑːlt/ (also cobalt blue)
 钴蓝的,深蓝色的;蓝绿色的
having a deep blue or greenish-blue colour