"Endolymphaticus" is an uncommon medical term that refers to the endolymphatic system in the inner ear. The correct spelling of this word is pronounced /ɛndoʊlɪmˈfætɪkəs/ and is spelled based on the International Phonetic Alphabet (IPA). The prefix "endo-" means "inside," "lymph" refers to fluid in the body, and "-aticus" means "related to." Together, the word describes the fluid-filled canals and sacs inside the inner ear responsible for hearing and balance. Spelling the word accurately is important to accurately communicate about inner ear disorders and treatments.