gill



gill defined in 1951 year

gill - gill;
gill - (1) (Bot.). See also: Lamella, Gill-fungi. (2) (Zool.). Respiratory organ of aquatic animals: a projection of external surface of body or of internal layer of gut, well supplied with blood; through gill surface interchange by diffusion of oxygen and carbon dioxide between water and blood occurs. Often complex form, providing large surface area. Gills of most fishes are internal gills within gill slits, consisting of projections from wall of pharynx, i.e. endodermal. Gills of amphibian and dipnoan larvae, and of adults of some urodeles, are external gills, from epidermis of gill-slits, i.e. ecto-dermal.

near gill in Knolik


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