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.
†RATTAR-EBB, n.comb. Also rat(t)er — (Jak.). The ebb of the spring tide when the sea retreats farther than usual uncovering areas which are seldom accessible (Sh. 1866 Edm. Gl., 1908 Jak. (1928), 1914 Angus Gl.). Also ratter o' a ebb (Jak.). See Grefster, Grimster.
[Orig. obscure.]