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| gill [ gil ] (plural gills) |
noun |
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| Definition: |
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1. breathing organ of fish: the organ that fish and some other water animals use to breathe, consisting of a membrane containing many blood vessels through which oxygen passes. They are internal in most fish and external in tadpoles and some mollusks.
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2. spore-producing organ of mushroom: a thin radiating plate on the underside of the cap of a mushroom or other fungus where its spores are produced
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| [14th century. < Old Norse] |
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  gilled adjective |
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green around the gills appearing nauseated (informal)
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to the gills to the fullest possible extent
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