gill

(animal anatomy) a breathing organ of fish and other aquatic animals

(of a fish) a gill slit or gill cover

(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

(animal anatomy) the fleshy flap that hangs below the beak of a fowl; a wattle

(figuratively) the flesh under or about the chin; a wattle

(spinning) one of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments