---
kind: "unit"
title: "21"
title_heading: "Food and Drugs"
key: "ch9/schII"
level: "subchapter"
label: "Subchapter II"
heading: "Definitions"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/21/ch9-schII"
sections_count: 5
---

# Subchapter II — Definitions

Title 21 — Food and Drugs › Chapter 9 — Federal Food, Drug, and Cosmetic Act

## Sections

- [§321. Definitions; generally](/usc/21/321.md)
- [§321a. “Butter” defined](/usc/21/321a.md)
- [§321b. “Package” defined](/usc/21/321b.md)
- [§321c. Nonfat dry milk; “milk” defined](/usc/21/321c.md)
- [§321d. Market names for catfish and ginseng](/usc/21/321d.md)