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.
¶ROSTACK, n. The dab, Limanda limanda (Mry. c.1890 Gregor MSS.).
[? Cf. Gael. roisteach, the roach or bream. The definition above may be due to a misunderstanding.]