A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 1963 (DOST Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
Quotation dates: 1499-1500
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Irrationall, -ale, a. [L. irratiōnālis, e.m.E. in this sense (1635), earlier (1551) applied to an irrational number or surd.] Not endowed with reason. — a1500 Henr. Fab. 389.
Thocht brutall beistis be irrationall [B. -ale], That is to say, wantand discretioun a1500 Ib. 849.
Greting to God … To brutall beistis and irrationall
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"Irrationall adj.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 6 Dec 2025 <http://www.dsl.ac.uk/entry/dost/irrationall>
