Medical Definition of NITRIFICATION. : the oxidation (as by bacteria) of ammonium salts to nitrites and the further oxidation of nitrites to nitrates.See nitrification defined for kids.ADVERTISEMENT.edical Definition of NITRIFICATION. : the oxidation (as by bacteria) of ammonium salts to nitrites and the further oxidation of nitrites to nitrates.
1. cladding-a protective covering that protects the outside of a building. facing. protective cover, protective covering, protection-a covering that is intend to protect from damage or injury; they had no protection from the fallout; wax provided protection for the floors.
cladding job 6543 image by jazzid from Fotolia.com. Exterior cladding is a protective layer of materials that separates a building's structure and interior from exterior elements, such as weather and sound.The exterior cladding is often not one material but an assembly of materials, and each material has its own importance in blocking exterior conditions.ladding job 6543 image by jazzid from Fotolia.com. Exterior cladding is a protective layer of materials that separates a building's structure and interior from exterior elements, such as weather and sound.