μέσσᾰτος · messatos — LSJ
midmost, ἐν μεσσάτῳ for ἐν μέσῳ, Il. 8.223; Att. μέσατος, υἱός Ar. V. 1502, cf. Men. 267, Theoc. 21.19, IG 14.2012A33 (Sulp. Max.), Opp. C. 1.112, D.P. 204:—in later Ep. μεσσάτιος, Call. Dian. 78, D.P. 296, Opp. C. 4.442. (For the form, cf. νέατος, τρίτος τρίτατος.)