• (n.) A worker in metals, or one skilled in metals.
Met'al·list noun A worker in metals, or one skilled in metals. 
The Metallist was a Russian Metalist Class training submarine of 375 tons displacement launched about 1920. The Metallist had a top speed of 12 knots surfaced and 8 knots submerged and was armed with one 6 pdr gun and four 18 inch torpedo tubes.