CSN P CEN ISO/TS 4958 This document defines terms related to liposomes in nanotechnologies, within the context of biological systems and biomedical applications. In this context, liposomes are one form of lipid-based nanomaterials. This document does not address terms that can be relevant to other types of lipid-based particles (e.g. solid lipid nanoparticles). Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.