Middle English (in sense 'wealth, riches'): from Old French, from richerich + -esse-ess2; the current sense was first found in a medieval glossary of collective terms.
Definition of richesse in US English:
richesse
nounriˈʃɛsrēˈSHes
rare
A group of pine martens.
Origin
Middle English (in sense ‘wealth, riches’): from Old French, from riche rich + -esse -ess; the current sense was first found in a medieval glossary of collective terms.