Correct spelling for the English word "sadis" is [sˈadɪz], [sˈadɪz], [s_ˈa_d_ɪ_z] (IPA phonetic alphabet).
The word "sadis" typically refers to a misspelling of the word "sadist", which has a notable etymology. "Sadist" originates from the name of the Marquis de Sade, a French nobleman and author from the 18th century known for his explicit and often violent works. The term "sadism" was coined in the 19th century, transforming de Sade's name into a noun to describe pleasure derived from inflicting pain or cruelty on others. Over time, "sadist" evolved to become more commonly used in reference to individuals possessing such tendencies.