touchstone

noun

touch·​stone ˈtəch-ˌstōn 

plural touchstones

1

: a fundamental or quintessential part or feature : basis

a touchstone film of that decade

now considered a touchstone of the city's life

—Michael Specter

2

: a test or criterion for determining the quality or genuineness of a thing

Good service is one touchstone of a first-class restaurant.

3

: a black siliceous stone related to flint that is used to test the purity of gold and formerly silver by the streak left on the stone when rubbed by the metal

Did you know?

Since the early 16th century, touchstone has referred to a particular kind of siliceous stone (that is, stone containing silica) used to do a particular job: determine the purity of precious metals. The process involves comparing marks made by rubbing a sample of a metal of known purity to marks made by a metal of unknown purity. The method is accurate enough in the case of determining the purity of gold that it is still in use today. Figurative use extended from this literal use, with touchstone functioning as a word for a test or criterion to determine the quality of a thing, and later to refer to a fundamental or quintessential part or feature of something.

Synonyms of touchstone

• criterion
• standard
• benchmark

Choose the Right Synonym for touchstone

standard, criterion, gauge, yardstick, touchstone mean a means of determining what a thing should be.

standard applies to any definite rule, principle, or measure established by authority.

standards of behavior

criterion may apply to anything used as a test of quality whether formulated as a rule or principle or not.

questioned the critic's criteria for excellence

gauge applies to a means of testing a particular dimension (such as thickness, depth, diameter) or figuratively a particular quality or aspect.

polls as a gauge of voter dissatisfaction

yardstick is an informal substitute for criterion that suggests quantity more often than quality.

housing construction as a yardstick of economic growth

touchstone suggests a simple test of the authenticity or value of something intangible.

fine service is one touchstone of a first-class restaurant

Examples of touchstone in a Sentence

Good service is one touchstone of a first-class restaurant.

his book has long been a touchstone for travel writing that aspires to be literature

Recent Examples on the Web

But elsewhere Margaret—who produced the record with longtime collaborator Doug Saltzman—arranges the same core sounds into more interesting, textured configurations, wielding millennial touchstones without the baggage. —Linnie Greene, Pitchfork, 29 Apr. 2026

But that intangible touchstone status is harder to repeat, even as the new film — set two decades, one global recession, one global pandemic and an ever-mutating social media revolution later — likewise aims to capture the fraught spirit of its moment. —Guy Lodge, Variety, 29 Apr. 2026

Affordability was a touchstone. —David Weigel, semafor.com, 29 Apr. 2026

That’s always been my touchstone. —Danielle Minnetian, FOXNews.com, 29 Apr. 2026

Word History

First Known Use

1530, in the meaning defined at sense 3

Rhymes for touchstone

• alone
• atone
• backbone
• bemoan
• bluestone
• breastbone
• brownstone
• capstone
• cheekbone
• condone
• curbstone
• cyclone

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Kids Definition

touchstone

noun

touch·​stone ˈtəch-ˌstōn 

1

: a black stone formerly used to test the purity of gold and silver by the streak left on the stone when rubbed by the metal

2

: a test for judging something