εἶναι
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
Greek (Liddell-Scott)
εἶναι: ἀπαρ. τοῦ εἰμὶ (ὑπάρχω). ΙΙ. ἐν Ἡσ. Ἔργ. κ. Ἡμ. 351 τῷ προσιόντι προσεῖναι (ἔνθα κεῖται αντὶ του προσιέναι, ἀπαρ. τοῦ πρόσειμι, πλησιάζω) πιθανῶς εἶναι ἐφθαρμένον.
French (Bailly abrégé)
inf. de εἰμί.
English (Strong)
present infinitive from εἰμί; to exist: am, was. come, is, X lust after, X please well, there is, to be, was.