What term is used to describe the width of a vessel?

The term used to describe the width of a vessel is "beam." The beam measures the widest part of the boat and is crucial for various aspects of boat design and performance. A wider beam can provide greater stability and increased space for passengers and cargo, which is particularly important in recreational boating and the construction of larger ships.

Understanding this term is important for boaters as it influences factors such as maneuverability, stability in rough waters, and the vessel's overall design. Knowing the beam of your vessel can also help in docking and navigating through tight spaces. Other terms in the options relate to different aspects of a boat: freeboard refers to the distance from the waterline to the upper deck, stern is the rear part of a boat, and port refers to the left side of the boat when facing forward.