a variety of consolidated red clay used by Native Americans to make tobacco pipes
pipestone in American English
(ˈpaipˌstoun)
noun
a reddish argillaceous stone used by Native Americans for making tobacco pipes
Word origin
[1755–65; pipe1 + stone]This word is first recorded in the period 1755–65. Other words that entered Englishat around the same time include: avalanche, baroque, buckeye, caucus, lame duck