The correct spelling of the word is "Diverticule" (daɪˈvɜrtɪkjuːl). The word refers to a sac or pouch in the wall of an organ, commonly found in the digestive system. The spelling is derived from the Latin word "diverticulum," meaning "to turn aside." The "-cule" suffix is a diminutive ending used to indicate a small size or a minor degree. Incorrect spellings of the word include "diverticle" or "diverticula," which are commonly used but not recognized by standard medical dictionaries.