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.
¶PURSILL, n. Also purcill. An edible sea-weed, Alaria esculenta (n.Sc. 1825 Jam.), Badderlock.
[Phs. deriv. of Purse from its appearance.]