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.
†VALENTIAN, adj. Geol. Referring to the beds forming the lowest rocks of the Silurian system in S. Scot. (1876 C. Lapworth Catal. Western Sc. Fossils 2).
[From Valentia, the Roman name of Southern Scot. formed into a province of the Empire in A.D. 368, called after the Emperor Valentinian.]