aldehyde
Meaning
An organic compound containing the group –CHO, formed by the oxidation of alcohols.
Structure
Usage
Formaldehyde is a simple aldehyde used as a disinfectant and preservative.
The distinctive aroma of almonds is partly due to the presence of benzaldehyde.
In organic chemistry, an aldehyde group is highly reactive.
Etymology
The word 'aldehyde' is a modern chemical coinage, created by the German chemist Justus von Liebig in the 19th century. He derived it by contracting the Latin phrase 'alcohol dehydrogenatum', meaning 'alcohol deprived of hydrogen'. The first element, 'ald-', is a direct truncation of 'alcohol', while the second, '-ehyde', is a contraction of 'dehydrogenation'. This construction elegantly captures the compound's origin and chemical logic: it is formed by the controlled oxidation (removal of hydrogen) from an alcohol.
Analysis
- ald: Shortened from 'alcohol', from Medieval Latin 'alcohol', from Arabic 'al-kuḥl'. In this word, it denotes the alcohol source. - ehyde: Shortened from 'dehydrogenation', from Latin 'de-' (removal) + Greek 'hydōr' (water) + Greek 'genēs' (born of). In this word, it denotes the removal of hydrogen.