REGULATIONS
Rulings
AD/CVD
Notices
HTSUS
U.S. Code
Regs
More
Ports
About
Updates
Apps
Larger font
Smaller font
SEARCH
Sort by Rank
Titles Ascending
Titles Descending
10 per page
25 Result/page
50 Result/page
Regulations last checked for updates: Dec 16, 2025
Title 42 - Public Health last revised: Dec 04, 2025
All Titles
Title 42
Chapter I
Part 21
Subpart A - Subpart A—Definitions
§ 21.1 - Meaning of terms.
.list_box li,p,.cm-search-info,.cm-search-detail,.abt span,.expand-collapse_top
Get the CustomsMobile app!