What geometric shape is described as egg-shaped?

The term "ovoid" is used specifically to describe shapes that resemble or are shaped like an egg. It captures the characteristic roundedness along with a tapered end, distinct from other geometric shapes. An ovoid demonstrates an elongated form that is wider in the middle and tapering at both ends, which closely mimics the physical shape of an egg.

In contrast, the other options, while related to curves and shapes, do not embody the egg-like quality described. An ellipse refers to a specific type of oval shape, characterized by a set of points that are equidistant from two foci, but it does not convey the same tapered ends that qualify it as egg-shaped. A parabola is a specific curve derived from a quadratic function, which does not resemble an egg in shape. Similarly, a circle is defined as a shape where all points are equidistant from a center point, lacking the variability in width and tapering that defines ovoids.

Thus, the precise definition and shape characteristics make "ovoid" the appropriate choice to represent the concept of being egg-shaped.