Read the dictionary definition of gill. All definitions for this word.
1. respiratory organ of aquatic animals that breathe oxygen dissolved in water
2. 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
4. a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters
