---
kind: "section"
citation: "21 C.F.R. § 358.503"
title: "21"
number: "358.503"
heading: "Definitions."
url: "https://uscodex.org/cfr/21/358.503"
---

# §358.503. Definitions.


As used in this subpart:

- (a) **Corn and callus remover drug product.** A topical agent used for the removal of corns and calluses.
- (b) **Collodion-like vehicle.** A solution containing pyroxylin (nitrocellulose) in an appropriate nonaqueous solvent that leaves a transparent cohesive film when applied to the skin in a thin layer.
- (c) **Plaster vehicle.** A fabric, plastic, or other suitable backing material in which medication is usually incorporated for topical application to the skin.

## Notes

### Source

Source: 55 FR 33261, Aug. 14, 1990, unless otherwise noted.

### Authority

Authority: 21 U.S.C. 321, 351, 352, 353, 355, 360, 371.

### Source

Source: 55 FR 33255, Aug. 14, 1990, unless otherwise noted.