Dictionary.com
Thesaurus.com

opioid antagonist

American  
[oh-pee-oid-an-tag-uh-nist] / ˈoʊ piˌɔɪd ænˈtæg ə nɪst /

noun

  1. Pharmacology. any drug that counteracts the effects of an opioid, used primarily to treat opioid overdose and as a therapy for opioid or alcohol addiction.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.