BISTER municipality in the district of Raron- orientala in the canton of Valais in Switzerland It is bordered to the northeast and east by the commune of Grengiols, to the south by Termen, and to the west by Mörel-Filet. 2 . Possible typing error by BLISTER, blister-pack anglicism, by a type of preformed plastic and cardboard container or cardboard with cavities to house a product, such as tablets, medicines, batteries, sealed food and small products such as cables, plugs, hearing aids, etc.