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.
THREAVIA. Geol. A fossil gasteropod of the Upper Ordovician period (1946 A. Lamont in Quarry Managers' Jnl. XXIX. 635).
[From Threave, near Girvan, Ayrshire.]
