The Collaborative International Dictionary of English v.0.48:

knobkerrie \knob"ker`rie\, knobkerry \knob"ker`ry\, n. [Boer D.
   knopkirie, fr. D. knop-hout, knotty stick + Hottentot
   k["i]rri club.]
   A short wooden club with a knobbed end used as a missile
   weapon by Kafir and other native tribes of South Africa.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

knobkerry
    n 1: a short wooden club with a heavy knob on one end; used by
         aborigines in southern Africa [syn: knobkerrie,
         knobkerry]