ἐνδιπλόω
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)
A fold in two, Gal.UP14.6,7.12 (Pass.), Sor.1.14; fold in at the edge, Paul.Aeg.6.65:—hence ἐνδίπλ-ωμα, ατος, τό, and ἐνδίπλ-ωσις, εως, ἡ, folding, Gal.11.508.
German (Pape)
[Seite 834] darin verdoppeln, Galen.