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touchstone
['tʌʧstəun]
n
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met.
basanite
f
prop.&figur.
pierre de touche
English thesaurus
touchstone
['tʌʧstəun]
n
gen.
(
A.Rezvov
)
;
a fundamental or quintessential part or feature : basis
(
merriam-webster.com
A.Rezvov
)
;
a test or criterion for determining the quality or genuineness of a thing
(
merriam-webster.com
A.Rezvov
)
;
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
(
merriam-webster.com
A.Rezvov
)
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