The medical term "neo" is a prefix that is derived from the Greek word "neos" meaning "new" or "recent." In medical terminology, it is commonly used to refer to something new, recent, or relating to a new formation or growth. For example, terms like "neoplasm" (new growth/tumor), "neonatology" (the branch of medicine dealing with the care of newborns), and "neovascularization" (formation of new blood vessels) all contain the prefix "neo."
