DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   gill
       n 1: a British imperial capacity unit (liquid or dry) equal to 5
            fluid ounces or 142.066 cubic centimeters
       2: a United States liquid unit equal to 4 fluid ounces
       3: any of the radiating leaflike spore-producing structures on
          the underside of the cap of a mushroom or similar fungus
          [syn: gill, lamella]
       4: respiratory organ of aquatic animals that breathe oxygen
          dissolved in water [syn: gill, branchia]