Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II). Includes material from the 1976 supplement.
This entry has not been updated since then but may contain minor corrections and revisions.
†CASTLE, n.
1. = Cass, n., q.v. (Rxb. 1923 Watson W.-B.). The four cherry-stones were built up in the form of a castle, three being placed together and one above them. See Papes.
2. An isolated pillar of rock in the sea. Ork. 1966 New Orkney Bk. 101:
On Orkney waters there are several of these [stacks], some of which are called "castles". The best known of them all is the Old Man o' Hoy, a 450-feet-high column of well-bedded Upper Old Red Sandstone.