touchstone Syllabification: (touch·stone)Pronunciation: /ˈtəCHˌstōn/Definition of touchstone noun 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 performancetouchstone in other Oxford dictionaries Definition of touchstone in the British & World English dictionary
