Stirrup-shaped is a term that describes a particular shape that resembles the equestrian stirrup. It is a unique and distinctive shape that is often used in science, particularly in anatomy, biology, and even geology. However, there are several other synonyms that can be used in place of stirrup-shaped, such as U-shaped, horseshoe-shaped, loop-shaped, and bracket-shaped. All these synonyms describe a similar shape that curves inward at the top and extends outward at the bottom, forming a loop-like structure. These synonyms are often used interchangeably in various scientific contexts, depending on the preference of the writer or speaker.