[L. neut. of lactārius pertaining to milk, f. lact-, lac milk.] An establishment for the sale of milk; a dairy.
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.
1809. European Mag., LX. 22. Our milk houses are called lactariums.
1825. Hone, Every-day Bk., I. 103. He [S. Crisp, d. 1784] was the institutor of the Lactarium in St. Georges Fields.