Meaning & Definition of Gill in English

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

4. Respiratory organ of aquatic animals that breathe oxygen dissolved in water