What does Castelletum mean in Latin?

Castelletum, a proper noun, means “the Grand Châtelet of Paris”.

What is the genitive of Castelletum?

The genitive singular is Castelletī. Castelletum is neuter, second declension.

proper noun · neutersecond declension

Castelletum n sg (genitive Castelletī)

Borrowed from Old French chastelet (“little castle”), altered to the form of the etymological castellum, and used as a proper noun.

What does Castelletum mean in Latin?: Castelletum, a proper noun, means “the Grand Châtelet of Paris”.
What is the genitive of Castelletum?: The genitive singular is Castelletī. Castelletum is neuter, second declension.