S / suffībŭlum
noun

suffībŭlum

gen. suffībŭli · gender neuter · decl. 2nd
sub-fibula
a white four-cornered veil
a white four-cornered veil, worn on the head by priests and priestesses, Varr. L. L. 6, § 21 Müll.; cf. Fest. pp. 348 and 349 ib.