DORE-HOLM, an isle, in the parish of NorthmaVINE, county of Shetland. It is situated in the bay of St. Magnus, south of the mainland of the parish, and derives its name from a remarkable arch which passes through its centre, of lofty and capacious dimensions, and admitting boatmen to fish in the waters beneath, being lighted by an opening at the top. The islet is cue of the smallest of the Shetland group.