What does exuvium mean in Latin?

exuvium, a noun, means “synonym of exuviae”.

What is the genitive of exuvium?

The genitive singular is exuviī. exuvium is neuter, second declension.

noun · neutersecond declension

exuvium n (genitive exuviī)

neutersynonym of exuviae
Imbuis exemplum primae tu, Romule, palmae huius, et exuvio plenus ab hoste redis, tempore quo portas Caeninum Acrona petentem30 BCE – 16 BCE, Propertius, Elegiae 4.10.6
Si leonis exuvium non sufficit, adde vulpinum.If the skin of a lion does not suffice, sew on that of a fox.1466 – 1536, Erasmus, Adagia

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

exuvium ī, n

4 AV-, spoils, booty : exuvio plenus ab hoste redis, Pr.

Perhaps an alternative form of, or parallel formation from, exuviae.