### Question
What is the definition of isomer?


### Answer
The definition of **isomer** is as follows in *21 U.S.C. § 802*:

> any optical, positional, or geometric isomer

#### Citation:
  - *21 U.S.C. § 802*
  - Heading: **CHAPTER 12-MEAT INSPECTION > SUBCHAPTER I-CONTROL AND ENFORCEMENT > Part A-Introductory Provisions**

