Dictionaries of the Scots Language
Dictionars o the Scots Leid

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.

ROOST, n.³ Also ruist (Marw.). Fine rain, drizzle, fine hazy mist (Ork. 1845 Stat. Acc.² XV. 96, 1929 Marw.; Fif. 1968). Adj. roostie, -y, drizzling, misty.Ork. 1929 Marw.:
A fine roosty rain.Fif. 1956:
In Pittenweem they say that a roostie haar is a fog off the sea which starts in the middle of the day and lasts till about midnight or after, said to be the same as a sleepy-haar.