"gill" in the noun sense
a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters
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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