Source : Webster's Revised Unabridged Dictionary (1913)

Box kite \Box kite\
   A kite, invented by Lawrence Hargrave, of Sydney, Australia,
   which consist of two light rectangular boxes, or cells open
   on two sides, and fastened together horizontally. Called also
   {Hargrave, or cellular, kite}.

Source : WordNet®

box kite
     n : a kite shaped like a box open at both ends