[ Gr. &unr_; leek-green, green, fr. &unr_; a leek. ] A combining form signifying green;
n. [ Praseo- + didymium. ] (Chem.) An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6. [ 1913 Webster ]
n. [ Praseo- + -lite. ] (Min.) A variety of altered iolite of a green color and greasy luster. [ 1913 Webster ]