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We found 17 dictionaries with English definitions that include the word opioid:
Click on the first link on a line below to go directly to a page where "opioid" is defined.

General (11 matching dictionaries)

1. opioid: Merriam-Webster.com [home, info]
2. opioid: Oxford Dictionaries [home, info]
3. opioid: American Heritage Dictionary of the English Language [home, info]
4. opioid: Collins English Dictionary [home, info]
5. Opioid, opioid: Wordnik [home, info]
6. opioid: Wiktionary [home, info]
7. opioid: Webster's New World College Dictionary, 4th Ed. [home, info]
8. opioid: Infoplease Dictionary [home, info]
9. opioid: Dictionary.com [home, info]
10. Opioid: Wikipedia, the Free Encyclopedia [home, info]
11. opioid: Dictionary/thesaurus [home, info]

Medicine (5 matching dictionaries)

12. Opioid: MedTerms.com Medical Dictionary [home, info]
13. opioid: online medical dictionary [home, info]
14. opioid: Dictionary of Cancer Terms [home, info]
15. opioid: Medical dictionary [home, info]
16. Opioid: Drug Medical Dictionary [home, info]

Tech (1 matching dictionary)

17. opioid: Washington State Definitions and Abbreviations of Vetrinary Terms [home, info]

Quick definitions from Wiktionary (opioid) ▸ noun:  A substance that has effects similar to opium. ▸ noun:  (physiology) Any of the natural substances, such as an endorphin, released in the body in response to pain. ▸ noun:  (pharmacology) Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature. ▸ Words similar to opioid ▸ Usage examples for opioid ▸ Popular adjectives describing opioid ▸ Words that often appear near opioid ▸ Rhymes of opioid ▸ Invented words related to opioid