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εἶσι

Φιλοκαλοῦμέν τε γὰρ μετ' εὐτελείας καὶ φιλοσοφοῦμεν ἄνευ μαλακίας -> Our love of what is beautiful does not lead to extravagance; our love of the things of the mind does not makes us soft.
Τhucydides, 2.40.1

Greek (Liddell-Scott)

εἶσι: εἶσιν, γ΄ ἐν. τοῦ εἶμι (πορεύομαι).

French (Bailly abrégé)

3ᵉ sg. prés. de εἶμι.

Greek Monotonic

εἶσι: εἶσιν, γʹ ενικ. του εἶμι (ibo).

Russian (Dvoretsky)

εἶσι: 3 л. sing. praes. к εἶμι.