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From The Collaborative International Dictionary of English v.0.48:
Koluschan \Ko*lusch"an\, Kolushan \Ko*lush"an\, a. [From Russ. kalyushka piece of wood (worn in the nether lip).] Designating, or pertaining 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. [Webster 1913 Suppl.]