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.
¶ROOK, v.3, n.6
I. v. To moult (Cld. 1880 Jam.). Hence pa.p. rookit, applied to a bird when moulting or to an article of dress that is very bare or too small (Ib.).
II. n. Moult, moulting (Ib.).
[Phs. erron. for Pouk, v.1, id., q.v. ]