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.
In construction, cladding is used to provide a layer of protection to the exterior of a building against the weather. The materials used may be a combination of metals, aluminum, or plastic. This material is most commonly installed around windows, doors, roofs, and chimneys.ladding is used to make modern US pennies, which are zinc with a coating of copper. Cladding installation is a special skill among roofers and roofing installation technicians. Cladding is commonly installed around chimneys.