amino-

"compound in which one of the hydrogen atoms of ammonia is replaced by a hydrocarbon radical," 1863, from ammonia + chemical suffix -ine (2).

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.