What does mnēmosynum mean in Latin?

mnēmosynum, a noun, means “a keepsake, souvenir, or memorial”.

What is the genitive of mnēmosynum?

The genitive singular is mnēmosynī. mnēmosynum is neuter, second declension.

noun · neutersecond declension

mnēmosynum n (genitive mnēmosynī)

a keepsake, souvenir, or memorial
verum est mnemosynum mei sodalis.but because it is a souvenir of my drinking buddy.c. 84 BCE – 54 BCE, Catullus, Carmina 12.13

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

mnēmosynum ī, n

, μνημόσυνον, a memorial, Ct.

From Ancient Greek μνημόσυνον (mnēmósunon), from μνημοσύνη (mnēmosúnē, “memory”).