viridian noun 2adjective 1forms 3 noun2 •A bluish-green pigment made from chromium sesquioxide. •A bluish-green color. adjective1 •Of a bluish green colour.We walked out on to a balcony, looking down on the bright green fields, the grey-blue river lined with viridian poplars, and the red earth paths where the peasants were driving their animals […] — 1937 formsviridians · more viridian · most viridian