gill gill /ˈgɪl/

noun

1. Respiratory organ of aquatic animals that breathe oxygen dissolved in water  ( branchia , gill )
   respiratory organ of aquatic animals that breathe oxygen dissolved in water
    The fish uses its gills to extract oxygen from the water as it swims
   The fish uses its gills to extract oxygen from the water as it swims
   
   
2. Any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus  ( gill , lamella )
   any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus
   
3. A United States liquid unit equal to 4 fluid ounces  ( gill )
   a United States liquid unit equal to 4 fluid ounces
   
4. A British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters  ( gill )
   a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters