Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
Quotation dates: 1914-1915
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TIRSO(O), n. Also tirsic, tirsick (Ork. 1929 Marw.); tusso (Id.). [′tɪrsʊ, -ɪk]
1. The marsh ragwort, Senecio Jacobea (Ork. 1887 Jam., 1929 Marw., Ork. 1972).Ork. 1914 M. Spence Flora Orcad. 38:
Marsh Ragwort. These are called “tirsics” in East Mainland, “tirsoos” in West Mainland.Ork. 1915 H. Marwick Orkney 262:
Shu's nether a tirso or a dochan.
2. The common dock, Rumex obtusifolius (Ork. 1929 Marw., Ork. 1972).
[Etym. doubtful, phs. to be associated with Tirsipel from similarity in appearance.]You may wish to vary the format shown below depending on the citation style used.
"Tirso n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 19 Dec 2025 <http://www.dsl.ac.uk/entry/snd/tirsoo>
