imprecation
Concise Oxford English Dictionary © 2008 Oxford University Press:
imprecation/ɪmprɪˈkeɪʃn/
▶noun formal a spoken curse.
– derivatives
imprecatory adjective.
imprecatory adjective.
– origin ME: from L. imprecatio(n-), from imprecari ‘invoke (evil)’, from in- ‘towards’ + precari ‘pray’.
'imprecation' also found in these Oxford entries:

