Dictionaries of the Scots Language
Dictionars o the Scots Leid

Scottish National Dictionary (1700–)

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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.

OST, v. Also (e)ust, øst, üst. To curdle sweet milk by adding sour-milk or butter-milk, and heating (Sh. a.1838 Jam. MSS. XII. 192, üst, 1908 Jak. (1928), Sh. 1964). Ppl.adj. ostet, usted, curdled (Id.); vbl.n. ostin, østin, ustin, eusteen, curdled milk (Id.), ‡sometimes used as a poultice (Sh.¹⁰ 1964). Comb.: ost-milk, id. (Jak.). [ɔst, øst]Sh. 1914 Old-Lore Misc. VII. ii. 71:
Eusteen, hot milk separated by the addition of sherry or any acid “comforting” liquid which will reduce the milk to curd and whey. Sometimes eusteen is made from merely sour milk.