safener

noun
saf·en·er | \-f(ə)nə(r)\
plural -s

Definition of safener 

: a chemical used in an insecticidal or fungicidal spray to prevent damage to trees and foliage by the other ingredients in the spray

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First Known Use of safener

1933, in the meaning defined above

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The first known use of safener was in 1933

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