[1] : The Collaborative International Dictionary of English v.0.48

lug \lug\ lu^g, n. sw. lugg the forelock.
   1. the ear, or its lobe. scot.  prov. eng.
      1913 webster

   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.
      1913 webster

   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.
      1913 webster

   4. harness the leather loop or ear by which a shaft is held
      up.
      1913 webster

   5. zool. the lugworm.
      1913 webster

   6. a man; sometimes implying clumsiness. slang
      pjc

   lug bolt mach., a bolt terminating in a long, flat
      extension which takes the place of a head; a strap bolt.
      

   lug nut mach., a large nut fitting a heavy bolt; -- used
      especially of the nuts used to attach wheels to vehicles.
      

   lug wrench mach., a wrench used to tighten or loosen lug
      nuts, usually a steel rod having a hexagonally shaped
      socket which fits closely over the lug nut; sometimes in
      the shape of a cross, having several such sockets, one at
      the end of each arm, to accommodate nuts of different
      sizes.
      1913 webster +pjc
see also:
lug bolt lug nut lug wrench 

[2] : WordNet (r) 2.0

lug wrench
     n : a wrench with jaws that have projecting lugs to engage the
         object that is to be rotated

Lug Wrench >> L Words
Lug Wrench, definition of term: Lug Wrench
lug+wrench_pag1.html

Lug >> L Words
Lug, definition of term: Lug
lug_pag1.html

Allen Wrench >> A Words
Allen Wrench, definition of term: Allen Wrench
allen+wrench_pag1.html