Source : Webster's Revised Unabridged Dictionary (1913)

Machinist \Ma*chin"ist\, n. [Cf. F. machiniste.]
   1. A constrictor of machines and engines; one versed in the
      principles of machines.

   2. One skilled in the use of machine tools.

   3. A person employed to shift scenery in a theater.

Source : WordNet®

machinist
     n : a craftsman skilled in operating machine tools [syn: {mechanic},
          {shop mechanic}]