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ἕξει

Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται -> For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
Corpus Hippocraticum, Aphorisms 1.6.2

French (Bailly abrégé)

3ᵉ sg. f. de ἔχω;
dat. sg. de
ἕξις.

Russian (Dvoretsky)

ἕξει:
I 3 л. sing. fut. к ἔχω.
II dat. к ἕξις.