touchstone

About 0.92 uses per million words.

Meaning

1. noun A stone used to verify the quality of gold alloys by rubbing them in order to leave a visible trace.
2. noun A standard of comparison or evaluation.

Similar words

criterion standard measure bedrock cornerstone keystone centrepiece stake yardstick lynchpin

Often followed by

of for to and in by books is book

Word family

touchstones