Gill - Wikipedia A gill ( ɡɪl ⓘ) is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist
Gill - definition of gill by The Free Dictionary Fish breathe by swallowing water and passing it through gill slits on each side of their head Blood-filled filaments on the gills extract oxygen from the water as it flows through