imprecation

noun2

1. •
   The act of imprecating, or invoking evil upon someone; a prayer that a curse or calamity may befall someone.

   • Hear then this dreadful imprecation; hear it: / 'Tis lay'd on all; not any one exempt: […] — 1679
2. •
   A curse.

   • Mr. Gamfield growled a fierce imprecation on the donkey generally, but more particularly on his eyes; and, running after him, bestowed a blow on his head. — 1838