The Collaborative International Dictionary of English v.0.48:

Boer \Boer\, n. [D., a farmer. See Boor.]
   A colonist or farmer in South Africa of Dutch descent.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Boer
    n 1: a white native of Cape Province who is a descendant of
         Dutch settlers and who speaks Afrikaans [syn: Afrikaner,
         Afrikander, Boer]