Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I). Includes material from the 1976 supplement.
This entry has not been updated since then but may contain minor corrections and revisions.
Quotation dates: 1818, 1887
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AICHAN, Aiken, Achen, n.2 The cockle-shell, Cardium.Cld. 1887 Jam.6:
Aichan, aiken, achen, s. A small bivalve (Mactra subtruncata, Da Costa) found in sandy bays of the Firth of Clyde. . . . Myriads of aichan shells were dug up near Dumbreck, by the workmen engaged in cutting the canal between Glasgow and Paisley.Dmb. 1818 Visitor II. 233:
The bivalve sort, commonly called aichans.