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touchstone
['tʌʧstəun]
n
gen.
Probierstein
m
;
Prüfstein
m
;
Maßstab
Qualität
met.
Basanit
m
mining.
Lydit
m
;
Lydischer Stein
touchstones
n
gen.
Probiersteine
m
;
Prüfsteine
m
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