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toll (1)
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toll bridge
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Tollens reagent
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Tollens reagent
Tol·lens re·a·gent [ tóllənz ri àyjənt ]


noun 
Definition:
 
chemical solution for finding aldehydes: a solution of silver nitrate, ammonia, and sodium bicarbonate. Use: testing for aldehydes.
[After Bernhard Tollens (1841-1918), German chemist]
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