Webster's English Dictionary

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machinist

ma.chin.ist \m*-'she--n*st\ n 1a: a worker who fabricates, assembles, or 
   repairs machinery  1b: a craftsman skilled in the use of machine tools  1c: 
   one who operates a machine  archaic  2: a person in charge of the 
   mechanical aspects of a theatrical production  3: a warrant officer who 
   supervises machinery and engine operation