Etymology
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amino- 
1887 as an element in compound words in chemistry, from combining form of amine. Amino acid is attested from 1898.
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nitro- 

before vowels nitr-, word-forming element used scientifically and indicating nitrogen, nitrate, or nitric acid; from Greek nitron (see nitre).

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aceto- 

before vowels acet-, word-forming element from acetic and generally indicating compounds from or related to acetic acid, thus ultimately from Latin acetum "vinegar."

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