Valvae
(
θύραι διάπριστοι). A folding door or shutter, i. e. one
made of two or more leaves which fold back one behind the other. The house-doors were
sometimes of this sort, as the marks on a threshold in Pompeii show (Pliny ,
Epist. ii. 17, 5;
Orig. xv. 7, 4).