WIER, an island, in the parish of Rothsay-and-Eagleshay, county of Orkney; containing 96 inhabitants. This is a small low island, divided from that of Rousay, on the south-east side, by the narrow channel of Wier Sound; it is about two miles in length and one in breadth. The isle has a productive soil, but the cultivation is indifferent. There are some ruins of a church; and at a little distance from them, on an eminence, are those of a castle, built about the middle of the twelfth century.