Rigor, rigoris, pen. pro. Plin. iun.A vehement cold: hardenesse: stifenesse.Calor & Rigor, contraria, Plin.Horridus rigor.Val. Flac. Ferri rigor.Virg.The hardenesse of yron.Rigor naturæ. Pli. Rigour and hardnes of nature: rudenes.Rigor iuris. Modest. The rigour and extremitie of the law.Rigor stillicidij. Scæuo. The roughnesse of the house eaues where raine droppeth downe.Rigor neruorum. Cels. The stiffenesse of the sinewes.
Lewis and Short: Latin dictionary
rĭgor, ōris, m. [rigeo], stiffness, inflexibility, rigidity, numbness, hardness, firmness, rigor (not freq. till after the Aug. per.; not in Cic.; cf. durities). I.Lit.: tandem bruma nives affert pigrumque rigorem, Lucr. 5, 746: cervicis,
stiffness
,
rigidity
, Plin. 28, 12, 52, 192; 32, 8, 28, 89; cf.: immobilis faciei, Quint. 9, 3, 101: vultus (in portraits), Plin. 35, 9, 35, 58: nervorum, i. e.
a cramp
,
spasm
, Cels. 2, 1 and 7; so too simply rigor; and in plur., Plin. 26, 12, 81, 130; 35, 6, 27, 46.—B. Esp. 1.A straight course or direction: fluminis, Dig. 43, 12, 1, 5; cf. stillicidii, ib. 8, 2, 41; hence, in the agrimensores, a straight line or course (opp. flexus), Front. Expos. Form. p. 38 Goes.; Aggen. Limit. p. 46 fin.; Sicul. Fl. p. 5; Front. Colon. p. 120 al.—2.Hardness, firmness: auri, Lucr. 1, 492: ferri, Verg. G. 1, 143: saxorum, Ov. M. 1, 401 (with durities): lapidis, Plin. 36, 16, 25, 126: arborum, Vitr. 2, 9; Plin. 16, 40, 77, 209; Col. 4, 16, 4 al.—II.Transf., the stiffness produced by cold, for cold itself, chilliness, Lucr. 5, 640; 6, 368 (opp. calor); 307 (opp. ignis); cf. Alpinus, Ov. M. 14, 794: septentrionis, Tac. A. 2, 23: caeli et soli, Plin. 17, 24, 37, 217: recentissimus aquae, Col. 9, 14, 7: torpentibus rigore nervis, Liv. 21, 58 fin. et saep.— III.Trop., hardness, inflexibility, stiffness, roughness, severity, rigor (cf.: severitas, asperitas, morositas): accentus rigore quodam minus suaves habemus, Quint. 12, 10, 33 (cf. rigidus, II. init.): te tuus iste rigor, positique sine arte capilli ... decet,
rudeness
, Ov. H. 4, 77: nocuit antiquus rigor et nimia severitas, Tac. H. 1, 18 fin.: animi, id. A. 6, 50; cf. Plin. 7, 19, 18, 79; Sen. Ira, 1, 16, 13 (opp. constantia): disciplinae veteris, Tac. H. 1, 83: juris, Dig. 49, 1, 19.