What does the prefix "bi-" mean?

The prefix "bi-" means "two." It is derived from the Latin word "bi" meaning "twice" or "double." In medical terminology, this prefix is often used to denote conditions or phenomena involving two parts or elements. For instance, "bilateral" refers to something that occurs on both sides of the body. This understanding of "bi-" as indicating a dual aspect is essential for interpreting various medical terms accurately, providing clarity in communication among healthcare professionals. Understanding this prefix also helps in distinguishing it from other prefixes that denote different quantities, such as "uni-" for one, "tri-" for three, and "poly-" for many.