Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
¶PIRN, n.2 In phr. a pirn of ale, three gallons of ale.Sc. 1901 Scotsman (20 Aug.):
36 lb. of grain made about three gallons, or “a pirn” of ale.