Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
algor, ōris, m. [cf. algeo], cold (that is felt), coldness (class., for the ante-class. algus or algu; acc. to Charis. 23 P., even in Cic.), Plaut. Rud. 1, 3, 33: Prodit hiemps, sequitur crepitans hanc dentibus algor, Lucr. 5, 746 Lachm.: obest praegnantibus, Varr. R. R. 2, 7, 10: corpus patiens inediae, vigiliae, algoris, * Sall. C. 5, 3 (cf. Cic. Cat. 1, 10, 20: illam praeclaram tuam patientiam famis, frigoris, inopiae rerum omnium): confectus algore, * Tac. H. 3, 22. In Pliny for cold in gen. (even in the plur.): vites algore intereunt, Plin. 17, 24, 37, § 217; 8, 39, 59, § 139: corpus contra algores munire, Plin. 15, 4, 5, § 19.