Andromeda

As a proper noun referring to a specific celestial body or a mythological figure, this word is used as a unique identifier. It does not function as a common noun and therefore does not have a plural form in standard usage.

In astronomical contexts, it is often used as a shorthand for the Andromeda Galaxy (M31). In mythological contexts, it refers specifically to the princess of Ethiopia, distinguishing her from the constellation that bears her name.