n. [ Hind. nawāb, from Ar. nawāb, pl. of nāïb a vicegerent, governor. Cf Nawab. ] 1. A deputy or viceroy in India; a governor of a province of the ancient Mogul empire. [ 1913 Webster ]
2. One who returns to Europe from the East with immense riches: hence, any man of great wealth. “A bilious old nabob.” Macaulay. [ 1913 Webster ]