ἐπινεφής
From LSJ
ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
ές,
A clouded, dark, [ἀήρ] Arist.Pr.941a5, Thphr.CP5.12.2; ἐπινεφῆ a clouded sky, Id.Vent.51. II. bringing clouds, [ἄνεμος]ib.4.