pygisiacus

pȳgĭsĭăcus, a, um, adj. [πυγησιακός (not in use), from πυγή], qs.

• of or belonging to secret buttock-worship: puellam invitare ad pygisiaca sacra, i.e. to copulation, Petr. S. 140 (al. pygiaca, pygiciaca, in the same signif.).

pȳgisiacus, a, um (*πυγησιακός v. πυγή), den Steiß betreffend, Steiß-, sacra p. = paedicatio, Petron. 140, 5 (die Hdschrn. pigiciaca).