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.
Once the structure has been framed or masonry walls have been erected, the building cladding can be installed to the exterior surfaces. First a moisture or vapor barrier is installed to protect against moisture penetration and minimize the risk of rot or mold.hile the term cladding is widely used in Europe and Australia, these exterior finish materials are typically known as siding in North America. Before exterior cladding can be installed, the structural framing of the building must be complete.