The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
in engineering, a ring-shaped packing (made of rubber, leather, or other material) in the joints of machine components that prevents the passage of a liquid or gas from a high-pressure region into a low-pressure region.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.