1887 as an element in compound words in chemistry, from combining form of amine. Amino acid is attested from 1898.
Entries linking to amino-
amine n.
"compound in which one of the hydrogen atoms of ammonia is replaced by a hydrocarbon radical," 1863, from ammonia + chemical suffix -ine (2).
acetaminophen n.
U.S. name for "para-acetylaminophenol," 1960, composed of syllables from the chemical name: acetyl, a derivative of acetic (q.v.; also see acetylene) + amino- + phenol. In Britain, the same substance is paracetamol.