-lus (Latin)

Where does "-lus" come from?

The Latin suffix -lus, an alternative form of -ulus, traces back to the Proto-Indo-European suffix *-lós, which originally helped form nouns from verbal roots. As it evolved into Proto-Italic as *-elos and eventually into Latin, its function shifted to become a common diminutive marker. This transition illustrates how a once general morphological tool was repurposed over millennia to indicate smallness or affection.

Full etymology tree

• -lus (Latin), 'alternative form of -ulus'
  • inherited *-elos (Proto-Italic), 'Forms desubstantival and deadjectival diminutive nouns'
    • inherited *-elós (Proto-Indo-European)
      • derived *-lós (Proto-Indo-European), 'Forms agent nouns from verbal roots.'

Ancestors

• *-elos (Proto-Italic)

Descendants and derived words

• -ellus (Latin)
• -illus (Latin)

Updated June 2026

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