oxymorphone

[ok-si-mawr-fohn]
noun Pharmacology.
  1. a potent semisynthetic morphine-derived narcotic analgesic, C17H19NO4, used as a substitute for morphine.

Origin of oxymorphone

oxy-2 + morph(ine) + -one, components of its full chemical name
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018