Lin·er n.
 1. One who lines, as, a liner of shoes or clothing.
 2. An airplane or ship belonging to a transportation company; also, a line-of-battle ship; a ship of the line.
 3. Mach. A thin piece placed between two parts to hold or adjust them, fill a space, etc.; a shim.
 4. A lining2. Specifically: Steam Engine A lining within the cylinder, in which the piston works and between which and the outer shell of the cylinder a space is left to form a steam jacket.
 5. A slab on which small pieces of marble, tile, etc., are fastened for grinding.
 6. Baseball A ball which, when struck, flies through the air in a nearly straight line not far from the ground; also called line drive; as, he hit a sharp liner to right.

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 line drive
      n : (baseball) a hit that flies straight out from the batter;
          "the batter hit a liner to the shortstop" [syn: liner]