2. the fourth dav of the month, h.Merc. 19, Hes.Op.794,798, Ar.Nu.1131, Th.5.54, IG12.304.50,62, etc.; so Boeot. πετράς (q.v.); τετράδι γέγονας, prov. of one born to a life of labour (cf. “τετραδισταί” 11), Pl.Com.100, cf. Aristonym.4, Sannyr. 5.
b. the fourth day of the week, Wednesday, Cod.Just.9.4.6.1.
3. a space of four days, Hp.Prog.20.
4. the four quarters of the moon, Thphr.Sign.5,27,38.
III. κατὰ τετράδα διατετάχθαι in four divisions, Ascl.Tact.3.1.