noun🔗ShareA chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal."The artist used cobalt to create a vibrant blue pigment for her painting. "elementmaterialsubstancechemistryChat with AIVocabulary GamePractice Reading
noun🔗ShareCobalt blue."The artist used cobalt to paint the ocean a deep, vivid blue. "colormaterialChat with AIVocabulary GamePractice Reading
