Source : Webster's Revised Unabridged Dictionary (1913)

Skainsmate \Skains"mate`\, n. [Perhaps originally, a companion
   in winding thread (see {Skein}), or a companion in arms, from
   skain a sword (see {Skean}).]
   A messmate; a companion. [Obs.]

         Scurvy knave! I am none of his firt-gills; I am none of
         his skainsmates.                         --Shak.