δίκρεως

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

Source

Greek (Liddell-Scott)

δίκρεως: μερίς. ἡ, = τῷ προηγ., αὐτόθι 599. 5, 9.