Lewis Short
(adj.adv.) : mĕrācus, a, um, adj.merus
* Pure, unmixed, esp. of wine (class.).
* Lit.: vinum meracius,Cic. N. D. 3, 31, 78: uva,Prop. 2, 24 (3, 31), 27.
* Transf., of other things: helleborum,Hor. Ep. 2, 2, 137; cf. Pers. 4, 16.
* Trop.: libertas,Cic. Rep. 1, 43, 66: meracissimus scientiae fons,Sid. Ep. 3, 10.—Hence, adv.: mĕrācē, purely, without mixture (post-Aug.): minus, sed meracius bibere,Cels. 1, 3: rubere,Sol. 33, 18.—Transf.: purius, meracius amare,Sid. Ep. 4, 1.
Charlton T. Lewis, Charles Short, A Latin Dictionary