κλᾴξ
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, 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)
ᾱκός, ἡ, Dor. for κλείς,
A key, IG42(1).102.110, al. (Epid., iv B.C.), 5(1).1390.92 (Andania, i B.C.), Theoc.15.33.