Quartânus, pen. pro Aliud Adiect. Belonging to the fourth. vt, Quartana febris.Cic.A quartaine ague.Audiui Quartanam te discessisse. Cice. Alteram quartanam Pamphilus tuus mihi dixit decessisse, & alteram leuiorem accedere.Cic.Febri quartana liberari. Plin. Quartanas excutere. Plin. To shake off quartaine agues.Frigida quartana. Hor. Quartani. Tacit Souldiours of the fourth legion.
Lewis and Short: Latin dictionary
quartānus, a, um, adj. [id.], of or belonging to the fourth; esp., I.Of or occurring on the fourth day, quartan: febris, Cic. N. D. 3, 10, 24; Plin. 7, 50, 51, 166; Mart. 10, 77, 3.— Hence, as subst.: quar-tāna, ae, f. (sc. febris), an ague occurring every fourth day, a quartan ague (class.): in quartanam conversa vis est morbi, Cic. Fam. 16, 11, 1; cf. Cels. 2, 1, 20; Plin. 22, 25, 72, 150: frigida, Hor. S. 2, 3, 290.—II.Of or belonging to the fourth legion; plur. as subst.: quartāni, m., the soldiers of the fourth legion, Tac. H. 4, 37; Inscr. Orell. 3118.