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touchstone

touch·stone

touchstone

 
 
pronunciation:
tuhch ston
part of speech: noun
definition 1: a test or standard by which to evaluate the worth of something.
She was tired of her brother's performance being the touchstone by which her performance was always measured.
synonyms:
standard
similar words:
criterion
definition 2: a hard, black, fine-grained stone, such as jasper or basalt, against which gold and silver were formerly rubbed to test their quality.