Definitions of gill:
- noun: respiratory organ of aquatic animals that breathe oxygen dissolved in water
- noun: any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus
- noun: a United States liquid unit equal to 4 fluid ounces
- noun: a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters
- name: A surname (common: 1 in 3703 families; popularity rank in the U.S.: #424)
