It is not. “Vagina” and “penis” are medical terms whereas, because wenis doesn’t exist as a body part, it cannot be a proper medical term to describe one. It’s always difficult to know what has given rise to this question but we suspect that the individual asking the question may have seen an anatomical diagram which highlighted all the structures of the reproductive system. In this case, they probably saw external genitals like labia/testicles labeled with their corresponding medical term followed by an internal organ such as ovaries/anus labeled with its name followed by other words and phrases defining more about it or describing it (e.g., meta-laparotomy).