The crossword solution for the term 'Plasmic Prefix' is 'Ecto'. The prefix 'ecto-' is derived from the Greek word ektos, meaning 'OUTSIDE'. It is used to describe something that is located OUTSIDE of a cell or organism, such as ectoplasm. It is also used to describe something that is external to the body, such as ectopic pregnancy. In biology, it is often used to describe structures that are external to the cell, such as ectoderm and ectoparasites.