From ZooTerms (Dictionary of Invertebrate Zoology)
Arthropoda: Chelicerata) In Acari, the outer layer of cerotegument.cement layer: 1. (
2. (Arthropoda: Insecta) The thin layer outside the wax of certain insect bodies, that may consist of tanned protein or a shellac-like substance and may function in protecting the wax or take the form of meshwork reservoirs of lipids.