Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X, list of scientific terms with Scottish connections).
This entry has not been updated since then but may contain minor corrections and revisions.
†TUEDIAN, adj. Geol. Referring to a group of sedimentary strata of the Lower Carboniferous age occurring in S. Scot. (1856 G. Tate in Proc. Bwk. Nat. Club III. 219).
[From Tuedia, Lat. form of Tweed.]
