A "solid-body" refers to an object that has a definite shape and volume, meaning it does not change form easily. This term is often used in physics and engineering to describe materials that are not fluid or gas, such as metals, plastics, and wood. Solid bodies maintain their structure under normal conditions and can withstand various forces without deforming significantly. In the context of musical instruments, a solid-body guitar, for example, is made from a single piece of wood or a solid material, which contributes to its unique sound and durability. Unlike hollow-body guitars, solid-body guitars are less prone to feedback and are favored in genres like rock and metal for their sustain and tonal clarity.