What does rīvuscellum mean in Latin?

rīvuscellum, a noun, means “brook”.

noun · masculine

rīvuscellum

*rīvuscellum m

declension
form	singular	plural
nominative	/rosˈkʲɛllos/ /riβosˈkʲɛllos/	/rosˈkʲɛlli/ /riβosˈkʲɛlli/

From *rīvusculum (“little stream”) + -lum (diminutive ending). Hence an etymological double-diminutive like *arbuscellum or *rāmuscellum.

Italo-Romance

Gallo-Romance