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test·er | \ ˈte-stər 
\
\tester
noun (2)tes·ter | \ ˈtē-stər , ˈte- \
, ˈte- \Definition of tester (Entry 2 of 3)
: the canopy over a bed, pulpit, or altar
tester
noun (3)tes·ter | \ ˈte-stər \
\Definition of tester (Entry 3 of 3)
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The first known use of tester was in the 14th century
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