Gills themselves are the half-circle arches containing the thin tissue that allows for gas exchange between blood and water. Gill slits are often associated with sharks as they have multiple slits that allow water to pass out of the body after entering through the mouth. read more
(of a fish) A gill slit or gill cover. Gill nets are designed to catch a fish by the gills . (mycology) One of the radial folds on the underside of the cap of a mushroom, on the surface of which the spore-producing organs are borne. read more