Question

touchstone noun 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. 1 : a fundamental or quintessential part or feature : basis2 : a test or criterion for determining the quality or genuineness of a thing3 : a black siliceous stone related to flint and used to test the purity of gold and formerly silver by the streak left on the stone when rubbed by the metal

Accepted Answer

April 21, 2021 TUTCH-stohn "Reviewers mocked the movie 'Love Story,' but it was among the biggest box office hits of its time and became a cultural touchstone, especially for the catchphrase 'Love means never having to say you're sorry.'" — Hillel Italie, The Associated Press, 18 Feb. 2021"Alice's Adventures in Wonderland was an immediate success; over the 150-plus years since it has never gone out of print, remaining a touchstone of children's literature." — Eve Watling, The Independent (United Kingdom), 17 Mar. 2021

Word	touchstone
Date	April 21, 2021
Type	noun
Syllables	TUTCH-stohn
Etymology	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.
Examples	"Reviewers mocked the movie 'Love Story,' but it was among the biggest box office hits of its time and became a cultural touchstone, especially for the catchphrase 'Love means never having to say you're sorry.'" — Hillel Italie, The Associated Press, 18 Feb. 2021 "Alice's Adventures in Wonderland was an immediate success; over the 150-plus years since it has never gone out of print, remaining a touchstone of children's literature." — Eve Watling, The Independent (United Kingdom), 17 Mar. 2021
Definition	1 : a fundamental or quintessential part or feature : basis 2 : a test or criterion for determining the quality or genuineness of a thing 3 : a black siliceous stone related to flint and used to test the purity of gold and formerly silver by the streak left on the stone when rubbed by the metal

Stone Purity Touchstone Metal Test A Siliceous Determine