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The word querc��s could not be parsed. Trying a normal dictionary lookup:
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quercĕrus, v. querquerus.
quercētum (querquētum, Fest. s. v. querquetulanae, p. 261 Müll.), i, n. [quercus], an oak-wood, oak-forest, Varr. R. R. 1, 16: querceta laborant, Hor. C. 2, 9, 7; Fest. l. l.
quercĕus, a, um, adj. [quercus], of oak, oaken, oak- (post-Aug.): querceae coronae, garlands of oak-leaves, Tac. A. 2, 83; Aur. Vict. Epit. 3 fin.; Serv. ad Verg. A. 6, 772.
(quercĭcus, a, um, a false reading for querneus, Suet. Calig. 19; v. querneus.)
quercĭnus, a, um, adj. [quercus], of oak-leaves, Tert. Cor. Mil. 13.
quercus, ūs (gen. querci, Pall. 4, 7, 8; gen. plur. quercorum, Cic. Fragm. ap. Prisc. p. 717 P.; dat. and abl. plur. do not occur), f. [perh. from root kar (kal-k), to be hard; cf.: cornu calx, calculus].
querquĕrus or quercĕrus, a, um, adj. [cf. Gr. καρκαίρω, to tremble], cold to trembling, shivering (ante- and post-class.): querqueram frigidam cum tremore a Graeco κάρκαρα certum est dici, unde et carcer. Lucilius: Jactans me ut febris querquera, the ague, Paul. ex Fest. p. 256 Müll.; so, febris querquera, Plaut. Fragm. ap. Prisc. p. 719 P.: febris rapida et quercera, Gell. 20, 1, 26; also, absol.: querquĕra, ae, f., the ague: querqueras sanare, Arn. 1, 28; App. Mag. p. 297, 14 (al. querquerum).