Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
TORRACHAN, n. A tool used by granite-cutters to bore holes in stone, an auger (Abd. 1939). [′tɔrɑxən]
[Gael. torachan, an auger, wimble, etc. Cf. Torie.]