functional group

noun

Definition of functional group 

: a characteristic reactive unit of a chemical compound especially in organic chemistry

First Known Use of functional group

1892, in the meaning defined above

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The first known use of functional group was in 1892

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functional group

noun

Medical Definition of functional group 

: a characteristic reactive unit of a chemical compound

More from Merriam-Webster on functional group

Britannica.com: Encyclopedia article about functional group

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