"gills" in the noun sense

1. gill

a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters

2. gill

a United States liquid unit equal to 4 fluid ounces

3. gill, lamella

any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus

4. gill, branchia

respiratory organ of aquatic animals that breathe oxygen dissolved in water

Source: WordNet® (An amazing lexical database of English)

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