•sandstone • capstone • hearthstone
•headstone • gemstone • whetstone
•hailstone • gravestone
•greenstone • Wheatstone
•Tinseltown • ringtone • pitchstone
•millstone • whinstone • siltstone
•holystone • semitone
•stepping stone • coping stone
•baritone • acetone • dulcitone
•tritone • drystone • milestone
•cobblestone • gallstone • brownstone
•lodestone • soapstone • duotone
•microtone • bluestone • tombstone
•moonstone • touchstone
•sunstone • ironstone • undertone
•monotone • cornerstone
•Silverstone • overtone
•birthstone • flavone • endzone
•cortisone • ozone
a piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the color of the mark that they made on it.
a standard or criterion by which something is judged or recognized:
they tend to regard grammar as the touchstone of all language performance.
a piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the colour of the mark which they made on it; in figurative usage, something which acts as a test of genuineness, a criterion.
Touchstone is also the name of the fool in Shakespeare
's As You Like It
, who loyally accompanies Rosalind and Celia into exile.