What does quadribaccium mean in Latin?

quadribaccium, a noun, means “An ornament composed of four pearls or beads”.

What is the genitive of quadribaccium?

The genitive singular is quadribacciī. quadribaccium is neuter, second declension.

noun · neutersecond declension

quadribaccium n (genitive quadribacciī or quadribaccī)

quā^drĭbaccĭum and † quā^drĭ-bacĭum, ii, n. quattuor-bacca,

I. fourbeads, four-pearls, an ornament composed of four pearls, Inscr. Murat. 139, 1.