Epistylium, lij, n. g. Varro. A little pyller in buylding set on a greater, also the chapiter of a piller.Epistropheus.The foremost ioint in the necke.
Lewis and Short: Latin dictionary
ĕpistlĭum, ii, n., = e)pistu/lion, in arch., the cross-beam that rests on the columns, the architrave, Vitr. 3, 1 sq.; 4, 3; 5, 1; Varr. R. R. 3, 5, 11; Plin. 36, 14, 21, 96; cf. Paul. ex Fest. p. 82, 11 Müll. Isid. Orig. 15, 8, 15; 19, 10, 24; Vulg. 3 Reg. 7, 6 al.