vitamin
vita(life)+amine(アミノ酸)
アミノ酸が含まれていると考えられていたことから
https://gyazo.com/8e369103a5a6c3426e93cf8502362965
source: By Ragesoss - Own work, CC BY-SA 3.0,
noun
any of a group of organic compounds which are essential for normal growth and nutrition and are required in small quantities in the diet because they cannot be synthesized by the body.
ビタミン; 〖形容詞的に〗ビタミンの
ORIGIN
early 20th century: from Latin vita ‘life’+ amine, because vitamins were originally thought to contain an amino acid.