from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See opiate.
- adj. Opiate.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance that is like opium.
- n. Any of the natural substances, such as an endorphin, released in the body in response to pain.
- n. Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.
opi(um) + -oid.(American Heritage® Dictionary of the English Language, Fourth Edition)
From opium + -oid (Wiktionary)