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.
ROOKLO, n. Also rookler (Ork. 1929 Marw.). The rough limpet, Patella athletica (Ork. 1954 Ork. Miscellany II. 56).
[Extended usage ad. Norw. rukla, a wrinkle, raised stripe, from its rugose shell. Cf. Ruckle.]