The Collaborative International Dictionary of English v.0.48:

Wapinschaw \Wap"in*schaw\, n. [Scot. See Weapon, and Show.]
   An exhibition of arms. according to the rank of the
   individual, by all persons bearing arms; -- formerly made at
   certain seasons in each district. [Scot.] --Jamieson. Sir W.
   Scott.
   [1913 Webster]