Source : Webster's Revised Unabridged Dictionary (1913)

Koluschan \Ko*lusch"an\, Kolushan \Ko*lush"an\, a. [From Russ.
   kalyushka piece of wood (worm in the nether lip).]
   Designating, or pert. to, a linguistic stock of North
   American Indians comprising the Tlinkit tribes of the
   Alexander Archipelago of southeastern Alaska and adjacent
   coast lands. Their language bears some affinity to Mexican
   tongues.