Acids

Lavoisier had named the active portion of the atmosphere oxygen (acid-producer) because it was thought that all acids containe d oxygen, but he was proven wrong with the discovery of hydrocyanic and hydrosulfuric acid.
 Claude-Louis Berthollet France 1789 Acids

Lavoisier had named the active portion of the atmosphere oxygen (acid-producer) because it was thought that all acids containe d oxygen, but he was proven wrong with the discovery of hydrocyanic and hydrosulfuric acid.