The prefix "zo-" is derived from the Greek word "zoion," meaning "animal" or "living being." It is often used in scientific and medical terminology to describe living organisms and their behavior. Some synonyms for the prefix "zo-" include "bio-," "fauna-," and "vivo-". "Bio-" refers to life or living organisms, while "fauna-" specifically refers to animal life. "Vivo-" can also be used to describe living organisms, but is often used to refer to the ability of a substance to sustain life. Other related terms include "zoological," meaning relating to the study of animals, and "zoography," meaning the description of animals.