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A three-dimensional geometric figure is referred to as a solid. Solids are defined by having length, width, and height, which distinguishes them from two-dimensional figures that only have length and width. Solids include various shapes such as cubes, spheres, cylinders, and pyramids, among others.

In contrast, a plane represents a flat, two-dimensional surface that extends infinitely in all directions, while a polygon refers to a two-dimensional shape with straight sides, like triangles and rectangles. A segment specifically pertains to a line segment, which is a part of a line that has two endpoints, and it is also a two-dimensional concept. Therefore, the term "solid" accurately encapsulates the concept of a three-dimensional figure, making it the correct choice.