butorphanol

[ byoo-tawr-fuh-nawl, -nol ]
/ byuˈtɔr fəˌnɔl, -ˌnɒl /

noun Pharmacology.

a narcotic analgesic, C21H29NO2, administered by injection to treat moderate to severe pain.

Origin of butorphanol

as contraction of the chemical name 17-(cyclobutylmethyl)morphinan-3,14-diol