noun 1.the respiratory organ of aquatic animals, as fish, that breathe oxygen dissolved in water.
2.Also called lamella. one of the radiating vertical plates on the underside of the cap of an agaric mushroom.
verb (used with object) 4.to gut or clean (fish).
Idioms5.to catch (fish) by the gills in a gill net.
6.green/white around the gills, somewhat pale, as from being sickly, nervous, or frightened: When he heard how much the bill was, he looked a little green around the gills.
7.to the gills, Informal. fully; completely; totally: After that big meal we were all stuffed to the gills.
Origin:
1300–50; Middle English gile < Scandinavian; compare Old Norse gjǫlnar < *gelnō; cognate with Swed gäl, Danish gælle, Norwegian gjelle gill
Related formsgill-less, adjective
gill-like, adjective