[L. neut. of lactārius pertaining to milk, f. lact-, lac milk.] An establishment for the sale of milk; a dairy.

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1772.  Public Advertiser, 25 Dec., 4/1. The Lactarium … is greatly improved by the Addition of a Cowhouse, so contrived, that you may have Milk Bub and Syllabub hot from the Cow directly, and see the Cow milked as you sit in the Lactarium.

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1809.  European Mag., LX. 22. Our milk houses are called lactariums.

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1825.  Hone, Every-day Bk., I. 103. He [S. Crisp, d. 1784] was the institutor of the Lactarium in St. George’s Fields.

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