pĕtaurum, i, n., = πέταυρον,
a stage or spring-board used by tumblers and rope-dancers, Lucil. ap. Fest. s. v. petauristae, p. 206 Müll.; Mart. 2, 86, 8; 11, 21, 3; Juv. 14, 265; Manil. 5, 434; Petr. Fragm. 13.
petaurum ī, n , πέταυρον, a tumbler's plank, spring-board: iactata petauro Corpora, Iu. ...
An Elementary Latin Dictionary