Also booza, bouza, boosa. [Turkish bōza ‘a kind of thick white drink made of millet fermented’ (Redhouse).]

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  A popular acidulated drink in Egypt, etc., made by fermenting an infusion of millet-seed, with the addition of certain astringent substances; also an inebriating preparation of damel-meal, hemp seed and water.

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1656.  Blount, Glossogr., Boza, a drink in Turky made of seed, much like new mustard, and is very heady.

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1706.  trans. Lemery’s Treat. Aliments, III. ii. 292. The Bosa, so much esteemed by the Arabs and Egyptians, is a Composition made of the Leaves and Seed of Bangue.

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1847.  Craig, Bosa.

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1849.  Southey, Comm.-pl. Bk., Ser. II. 45. The Booza makers are a very necessary corporation in a camp.

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1879.  C. R. Low, Jrnl. Gen. Abbott, i. 97. We get plenty of supplies; grain, boosa, sheep, cows … are brought into camp.

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