Definition of oniomania in US English:

oniomania

noun

  • An obsessive or uncontrollable urge to buy things.

    ‘oniomania can affect either sex, but the vast majority of compulsive shoppers are adult females’
    • ‘‘Compulsive shopping’, which is formally known as oniomania, is not yet included in the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association.’

Origin

From Greek ōnios ‘for sale’, from ōnos ‘price, purchase’: see -mania.

Pronunciation

oniomania

/ˌōnēōˈmānēə/