lactam (English)

Where does "lactam" come from?

The English noun 'lactam' is formed as a blend of 'lac(tone)' and 'am(ide)'[1]. The term 'amide' itself derives from 'ammonia' combined with the suffix '-ide'[2], while 'lactone' originates from 'lacto-' combined with '-one'[3].

Full etymology tree

• lactam (English), 'Any of a class of cyclic amides that are the nitrogen analogs of lactones, formed by heating amino acids; the tautomeric enol forms are known as lactims.'
  • blend lactone (English), 'A cyclic intramolecular ester derived from a hydroxy acid.'
    • prefix lacto- (English), 'milk.'
    • suffix -one (English), 'a ketone'
  • blend amide (English), 'Any derivative of an oxoacid in which the hydroxyl group has been replaced with an amino or substituted amino group; especially such derivatives of a carboxylic acid, the carboxamides or acid amides'
    • affix ammonia (English), 'A gaseous, toxic compound of hydrogen and nitrogen, NH₃, with a pungent smell and taste.'
      • derived sal ammoniacus (Latin)
        • derived Ἄμμων (Ámmōn) (Ancient Greek), 'Amun'
          • borrowed jmn (Egyptian), 'Amun, a primeval god, personification of the hiddenness of the primeval waters, worshipped at Hermopolis as a member of the Ogdoad'
    • suffix -ide (English), 'Any of a group of related compounds - azide, polysaccharide, glycoside.'

Ancestors

• lactone (English)
• amide (English)

Descendants and derived words

• lactamase (English)
• macrolactam (English)
• spirolactam (English)
• thiolactam (English)
• β-lactam (English)

Sources

1. lactam (English) - Wiktionary
2. amide (English) - Wiktionary
3. lactone (English) - Wiktionary
4. ammonia (English) - Wiktionary
5. ide (English) - Wiktionary
6. id (Swedish) - Wiktionary
7. Ἄμμων (Ámmōn) (Ancient Greek) - Wiktionary
8. idus (Latin) - Wiktionary
9. jmn (Egyptian) - Wiktionary
10. h₂eydʰ- (Proto-Indo-European) - Wiktionary

Updated October 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris