DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tare
       n 1: an adjustment made for the weight of the packaging in order
            to determine the net weight of the goods
       2: any of several weedy vetches grown for forage
       3: weedy annual grass often occurs in grainfields and other
          cultivated land; seeds sometimes considered poisonous [syn:
          darnel, tare, bearded darnel, cheat, Lolium
    temulentum]
       4: the weight of a motor vehicle, railroad car, or aircraft
          without its fuel or cargo
       5: (chemical analysis) a counterweight used in chemical
          analysis; consists of an empty container that counterbalances
          the weight of the container holding chemicals