ūsuārius, a, um,
adj. id., of or belonging to use, usuary, viz., Pass., that is used, made use of: servus, i. e. whom one has the use of, but does not own, Dig. 7, 8, 14; Gell. 4, 1, 23.
— Act., as subst.: ūsuā-rius, ii, m., one who uses or has the use of a thing, but no right of property in it: usus aquae personalis est: et ideo ad heredem usuarii transmitti non potest, Dig. 7, 8, 21: eadem et in usuario dicenda sunt, ib. 7, 1, 13, § 2.