What is "pseudovirion"

n. (label en virology) A synthetic viral particle, that cannot replicate, used to inject foreign nucleic acid into a cell

Pseudovirions are synthetic viruses used to inject genetic material, including DNA and RNA, with specific and desired traits into bacterial and eukaryotic cells. Pseudoviruses are closely related to viruses in structure and behavior but lack many characterists exhibited by true viruses, including the capability to replicate.