Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
‡REDCOLL. n. Also -coal, †rotcoll. The horse-radish, Armoracia rusticana (n.Sc. 1808 Jam., rotcoll; Cld. 1825 Ib., redcoal, Slk. 1929).
[O.Sc. redcol, 1673, Mid.Eng. radcoll, id. N.E.D. suggests connection with †radik, variant of radish.]