The Collaborative International Dictionary of English v.0.48:

Wickiup \Wick"i*up\ Wickyup \Wick"y*up\, n.
   Vars of Wikiup.
   [Webster 1913 Suppl.] Wiclifite

WordNet (r) 3.0 (2006):

wickiup
    n 1: a lodge consisting of a frame covered with matting or
         brush; used by nomadic American Indians in the southwestern
         United States [syn: wickiup, wikiup]