/ Dictionary / Index P pipe clay: Meaning and Definition of Find definitions for: pipe' clay" Pronunciation: [key] a fine, white clay used for making tobacco pipes, whitening parts of military or other dress, etc. pipe-clay Pronunciation: (pīp'klā"), [key] — v.t. to whiten with pipe clay. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pipeclay (Thesaurus) pipe bomb pipe cleaner Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language