Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

opioid

play
adjective opi·oid \ˈō-pē-ˌȯid\

Definition of opioid

  1. 1 :  possessing some properties characteristic of opiate narcotics but not derived from opium

  2. 2 :  of, involving, or induced by an opioid




2

opioid

noun opi·oid

Definition of opioid

  1. 1 :  any of a group of endogenous neural polypeptides (as an endorphin or enkephalin) that bind especially to opiate receptors and mimic some of the pharmacological properties of opiates —called also opioid peptide

  2. 2 :  a synthetic drug possessing narcotic properties similar to opiates but not derived from opium; broadly :  opiate 1a



1967

First Known Use of opioid

1967


Medical Dictionary

1

opioid

adjective opi·oid \ˈō-pē-ˌȯid\

Medical Definition of opioid

  1. 1:  possessing some properties characteristic of opiate narcotics but not derived from opium

  2. 2:  of, involving, or induced by an opioid




2

opioid

noun opi·oid

Medical Definition of opioid

  1. 1:  any of a group of endogenous neural polypeptides (as an endorphin or enkephalin) that bind especially to opiate receptors and mimic some of the pharmacological properties of opiates—called also opioid peptide

  2. 2a:  a synthetic drug (as methadone) possessing narcotic properties similar to opiates but not derived from opiumb:  opiate 1—not used technically




Learn More about opioid

  1. Medical Dictionary: Definition of "opioid" Britannica.com: Encyclopedia article about "opioid"


Seen and Heard

What made you want to look up opioid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a timid, meek, or unassertive person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

reduce disapprove perplex soothe
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ