pipe clay definition by Webster's New World
a white, plastic clay used for making clay tobacco pipes or pottery, for whitening leather, etc.
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
to whiten with pipe clay
pipe clay definition by American Heritage Dictionary
A fine white clay used in making tobacco pipes and pottery and in whitening leather.