The crossword solution for the term 'Prefix with Morph or Plasm' is 'Ecto'. Ecto is a prefix derived from the Greek word ektos, meaning 'OUTSIDE'. It is used to describe something that is OUTSIDE of the body, such as ectoplasm, which is a substance believed to be associated with paranormal activity. It is also used in the medical field to describe organs or tissues that are located OUTSIDE of the body, such as ectopic pregnancies. Morph and plasm are two other terms that can be prefixed with ecto, such as ectomorphic, which refers to a body type characterized by a slender build, and ectoplasmic, which refers to a form of energy or matter that is believed to be associated with paranormal activity.