Definition of "Dopper"

Dopper

noun
plural Doppers
1. (derogatory) An Anabaptist or Baptist.
  Quotations
  This is a Dopper, a she Anabaptist
  1625 (first performance), Ben[jamin] Jonson, The Staple of Newes. […], London: […] I[ohn] B[eale] for Robert Allot […], published 1631, (please specify the page), (please specify the scene number in lowercase Roman numerals)
2. (South Africa) A member of the Reformed Churches in South Africa, a Calvinistic denomination.
  Quotations
  His Dopper community of the northeastern districts of the Cape Colony was considered more pious and socially conservative than any other community in the colony.
  2003, Hermann Buhr Giliomee, The Afrikaners: Biography of a People, page 177