what is molybdenum used for
Medical Definition of MOLYBDENUM. : a metallic element that resembles chromium and tungsten in many properties, is used especially in strengthening and hardening steel, and is a trace element in plant and animal metabolismâsymbol Mo; see element table.efinition of MOLYBDENUM. : a metallic element that resembles chromium and tungsten in many properties, is used especially in strengthening and hardening steel, and is a trace element in plant and animal metabolism â see element table. See molybdenum defined for kids. ADVERTISEMENT.