Source : Webster's Revised Unabridged Dictionary (1913)

Brownist \Brown"ist\, n. (Eccl. Hist.)
   A follower of Robert Brown, of England, in the 16th century,
   who taught that every church is complete and independent in
   itself when organized, and consists of members meeting in one
   place, having full power to elect and depose its officers.

Brownist \Brown"ist\, n. (Med.)
   One who advocates the Brunonian system of medicine.