Ustad (Persian: استاد; /ostɑːd/, master or teacher; Arabized: استاذ ustadh), a Persian word, is an honorific title for a Muslim man in South Asia. The title precedes the name and is usually used for well-regarded teachers and artists, most often musicians. Similarly, the term is used in some Martial Arts of South Asian origin to denote the rank of instructor. It is applied and used via informal social agreement. It is abbreviated as ut. or ud. Aside from the honorific, the word is generally used by its literal meaning to refer to any teacher, master or expert in Urdu. The title is also used by teachers of Arabic and Islam in the mosques of Indonesia. In Maldives, the title is used by people who possess a bachelors degree or above in the field of Law. Its feminine form is 'Ustada'.
- al-Ostath/al-Istath (Lisan al-Arab--The Tongue of Arab, by Ibn Mandhoor, 1232 ~ 1311 AH)