Opioid

noun

/ˈəʊpiɔɪd/

Word Frequency: 1.6

Definitions

1.nounA substance that has effects similar to opium.

2.nounAny of the natural substances, such as an endorphin, released in the body in response to pain.

3.nounAny of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.

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