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φῶ

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)

φῇς, φῇ, φῶμεν, etc.
sbj. prés. de φημί.

Russian (Dvoretsky)

φῶ: praes. conjct. к φημί.