noun
: a yellow crystalline salt FeC 2 O 4 .2H 2 O found in nature as humboldtine and formerly used in potassium oxalate solution as a photographic developer
noun
: a yellow crystalline salt FeC 2 O 4 .2H 2 O found in nature as humboldtine and formerly used in potassium oxalate solution as a photographic developer
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012