gill¹ /gil/

1. A membranous organ for breathing in water, usu in the form of a thin platelike or branched filamentous structure (zoology)
2. The wattle below the bill of a fowl
3. One of the radiating plates on the underside of the cap of a mushroom or toadstool
4. A projecting rib of a heating surface
5. The flesh round a person's jaw, as in green or white round the gills (ie sickly-looking)

1. To gut (fish)
2. To catch (fish) by the gills in a net

gill arch noun

(in fish) the incomplete jointed skeletal ring supporting a single pair of gill slits

gill cover noun

A fold of skin, usu with bony plates, protecting the gills

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