lūsōrĭus, a, um, adj. [lusor], of or belonging to a player.
I Lit.: pila, a playing-ball , Plin. 7, 56, 57, § 205: alveus cum tesseris, id. 37, 2, 6, § 13.—Hence,
2 Subst.: lūsōrĭum , ii, n., a place where shows of gladiators and wild beasts were given : statuit sibi triclinium in summo lusorio, Lampr. Heliog. 25; Lact. Mort. Persecut. 21.—
B Used for pleasure; hence, as subst.: lūsōrĭa , ae, f. (sc. navis), a vessel for pleasure, yacht , Sen. Ben. 7, 20, 3; and, transf., any kind of light vessel, cutter : lusoriis navibus discurrere flumen ultro citroque, with cruisers , Amm. 17, 2, 3.— Plur. : lusoriae, swift-sailing cruisers, cutters , Vop. Bonos. 15: de lusoriis Danubii, Cod. Th. 7, tit. 17.—
II Trop.
A That serves for amusement or pastime, sportive : quaestio, Plin. 7, 53, 54, § 180: arma, Sen. Ep. 117, 25: spectaculum non fidele et lusorium, id. ib. 80, 2.—
B Transf., that is done or given in play; hence, empty, ineffectual, invalid , = irritus: nomen, Sen. Ben. 5, 8, 3: lusorias minas alicui facere, Dig. 35, 3, 4: imperium, ib. 43, 8, 1.—Hence, adv.: lūsōrĭē , playfully, in sport, not in earnest, apparently : lusorie (causam) agens, Dig. 30, 1, 50, § 1.