Barr Bodies, also known as sex chromatin bodies, are distinct structures found within the nuclei of mammalian cells. They were first observed by Murray Barr in the early 20th century. These specialized bodies play a significant role in genetic regulation. Synonymous terms for Barr Bodies include chromatin body, X-chromatin body, or gender chromatin body. They are formed due to the inactivation of one of the X chromosomes in females during embryonic development, compensating for the double dose of X-linked genes. Barr Bodies are crucial in maintaining gene dosage balance between males and females, ensuring proper development and functioning. Understanding the synonyms for Barr Bodies helps in comprehending the diverse literature exploring this fascinating area of genetics.