Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a chamber that holds packing tightly around a moving part, as a piston rod, boat propeller shaft, etc., to prevent leakage of fluid along the part
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An enclosure containing packing to prevent leakage around a moving machine part.