Source : Webster's Revised Unabridged Dictionary (1913)

Lug \Lug\, n. [Sw. lugg the forelock.]
   1. The ear, or its lobe. [Scot. & Prov. Eng.]

   2. That which projects like an ear, esp. that by which
      anything is supported, carried, or grasped, or to which a
      support is fastened; an ear; as, the lugs of a kettle; the
      lugs of a founder's flask; the lug (handle) of a jug.

   3. (Mach.) A projecting piece to which anything, as a rod, is
      attached, or against which anything, as a wedge or key,
      bears, or through which a bolt passes, etc.

   4. (Harness) The leather loop or ear by which a shaft is held
      up.

   5. (Zo["o]l.) The lugworm.

   {Lug bolt} (Mach.), a bolt terminating in a long, flat
      extension which takes the place of a head; a strap bolt.