Fenestra rotunda is a Latin term that refers to the round window, a membrane-covered opening located in the inner ear. There are several synonyms for this term, including the cochlear window, which is another name commonly used to describe the structure due to its location and function. Some other common synonyms for fenestra rotunda include the secondary tympanic membrane, the round fenestra, or the vestibular window. While these terms may differ slightly in origin or usage, they all refer to the same structure in the ear and are frequently used interchangeably by medical professionals and researchers.