σπείσομεν

From LSJ

ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)

Source

French (Bailly abrégé)

1ᵉ pl. fut. ind. de σπένδω;
1ᵉ pl. épq. sbj. ao. de σπένδω.