### Question
What is the definition of opioid?


### Answer
The definition of **opioid** is as follows in *21 U.S.C. § 1536*:

> any drug having an addiction-forming or addiction-sustaining liability similar to morphine or being capable of conversion into a drug having such addiction-forming or addiction-sustaining liability

#### Citation:
  - *21 U.S.C. § 1536*
  - Heading: **CHAPTER 20-NATIONAL DRUG CONTROL PROGRAM > SUBCHAPTER II-DRUG-FREE COMMUNITIES > Part A-Drug-Free Communities Support Program**

