Which term refers to the left side of a boat?

The term that refers to the left side of a boat is "port." In nautical terminology, "port" specifically designates the left side when facing towards the bow (the front of the boat). This distinction is important for navigation and communication aboard vessels, as it helps to avoid confusion between directions.

Understanding this term becomes even more significant when considering the contrast with "starboard," which denotes the right side of the boat. The definitions of bow (the front of the boat) and stern (the back of the boat) highlight other essential parts of a vessel but do not pertain to directional terms. Therefore, "port" is the correct choice, as it accurately designates the left-hand side of a boat in a way that is universally understood in maritime contexts.