Radioiodide is a term commonly used in the medical field to describe a radioactive iodine isotope. This isotope is often used in nuclear medicine procedures, particularly in the diagnosis and treatment of thyroid cancer. While radioiodide is the most commonly used term, there are several synonyms that are used interchangeably, including iodine-131, radioisotope iodine, and radioiodine. These terms all refer to the same radioactive element, but some may be more commonly used in certain medical settings or geographic regions. It's important to note that while radioiodide has several synonyms, the medical community should use a standardized terminology for consistency and clarity in communication.