Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
DUOY, n. Also duie-oye. A great-grandchild (Sh. 1866 Edm. Gl.; Ork. 1929 Marw.); also a great-great-grandchild (Ork. 1887 Jam.6, duie-oye; Ork.3 c.1915). [′duɔi]
[Gael. dubh-ogha, great grandson's grandson, from dubh, black, and ogha, grandchild; “dubh is used to add a step to fionn-ogha [grandchild's grandchild], though fionn here is really a prep., and not fionn, white” (MacBain).]
