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

1913, "amine produced by the decomposition of histidine."

"removal of an amino group," 1912, from de- + amine + noun ending -ation.

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

1966, from keto- (before vowels ket-), combining form of ketone, + amine.

compound organic chemical, 1959, from DOPA, the amino acid (from first letter of elements of dioxyphenylalanine), + amine.

also thiamine, alternative name for vitamin B1, 1937, coined by U.S. chemist Dr. Robert R. Williams (1886-1965) from thio-, indicating the presence of sulfur, from Greek theion "sulfur," + amine, indicating the amino group. Or the second element might be from vitamin.

1920, originally vitamine (1912) coined by Polish biochemist Casimir Funk (1884-1967), from Latin vita "life" (from PIE root *gwei- "to live") + amine, because they were thought to contain amino acids. The terminal -e formally was stripped off when scientists learned the true nature of the substance; -in was acceptable because it was used for neutral substances of undefined composition. The lettering system of nomenclature (Vitamin A, B, C, etc.) was introduced at the same time (1920).