Scottish National Dictionary (1700–)
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About this entry:
First published 1976 (SND Vol. X, list of Scottish place-names).
This entry has not been updated since then but may contain minor corrections and revisions.
THIRSA. Thurso in Caithness (Cai. 1902 J. Horne Canny Countryside 70, 1922 Id, Poems and Plays 71, Cai. 1975). [′θɪrzə]