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ameliorant

noun
ame·​lio·​rant | \əˈmēlyərənt, -lēə-\
plural -s

Definition of ameliorant 

: a substance that aids plant growth primarily by improving the physical condition of the soil

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First Known Use of ameliorant

1851, in the meaning defined above

History and Etymology for ameliorant

ameliorate + -ant

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The first known use of ameliorant was in 1851

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