διχομηνία
From LSJ
νοεῖν γάρ ἐστι κρεῖττον καὶ σιγὴν ἔχειν → it's better, you see, to understand and yet say nothing (Menander)
English (LSJ)
ἡ,
A full moon, IG12.6.62, PRev.Laws 56.18 (iii B. C.), LXXSi.39.12, Gem.8.1, etc.; δ. μηνὸς Μεταγειτνιῶνος Inscr.Prien.4.45 (iv B. C.); ἡ σελήνη δ. ἦγεν Plu.Dio23. 2 mid-menstrual period, Hp. Oct.13.