τετρά-γῠος · tetra-gyos — LSJ
containing four γύαι of land, μέγας ὄρχατος . . τ. Od. 7.113; νειὸς τ. Call. Dian. 176 (v.l. τετρόγ- in PAmh. 2.20v. 3), A.R. 3.412, 1344.
neut. as Subst., a measure of land, as much as a man can plough in a day, Od. 18.374; also τ. αὖλαξ Orph. A. 871.