A Muslim claiming descent from Mohammed’s grandson Husain. (Collins Dictionary)
A Muslim honorary title. (Collins Dictionary)
An Islamic chief or leader. (Merriam – Webster)
A Muslim claiming descent from Muhammad, especially through Husayn, the prophet’s younger grandson. (Oxford Dictionaries)
A respectful Muslim form of address. (Oxford Dictionaries)
Sayyid. Encyclopedia Britannica.
In Pakistan and India sayyids are numerous, being one of the four main groups of Muslims. They also constitute an influential extratribal class in Yemen, claiming descent from the Prophet through an ancestor who came south from Iraq more than a millennium ago. Many dynasties have also claimed to be sayyids in the restricted sense.