ἐμμέσῳ
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)
ἐμμέσῳ: adv. NT v. l. = ἐν μέσῳ.
adv.
au milieu de
[p. assimil. p. ἐν μέσῳ]