Source: http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0059:entry%3Dmensis
Timestamp: 2019-04-19 19:23:18+00:00

Document:
I.gen. plur. regularly mensium; “freq. mensum,” Plaut. Most. 1, 1, 78; Cic. Phil. 12, 9, 22; id. Verr 2, 74, 182 al.; Caes. B. G. 1, 5, 3; Ov. M. 8, 500; id. F. 5, 187; 424; Liv. 3, 24, 4; 3, 25, 4; Plin. 7, 11, 9, § 49 et saep.; v. Neue, Formenl. 1. p. 265 sq.), m. root ma-, measure; Sanscr mas; Gr. μην, the measure of time; cf. Goth. mena; Germ. Mond; Engl. moon, month, a month.
II. Transf., esp. in plur., the menses: “prodest mulierum mensibus retardatis,” Plin. 21, 21, 89, § 156; 22, 22, 40, § 83; 22, 25, 71, § 147; 23, 7, 71, § 138 et saep.—In sing.: “a muliere incitati mensis,” Plin. 17, 28, 47, § 267; 28, 7, 23, § 77.—Transf., of female animals, the yearly flux, Varr. R. R. 2, 7 med.

References: § 49
 v. 
 § 156
 § 83
 § 147
 § 138
 § 267
 § 77