Where does “-us” come from?
-us (Middle Welsh) comes from Latin -osus, from Old Latin -osos, from Latin ont-to-s, from Latin -o-wont-to-s.
-us (Middle Welsh): -ous, full of, prone to
Ancestry of “-us”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Latin | -osus | -ose, -ous; full of, overly, prone to |
| 2 | Old Latin | -osos | accusative masculine plural of -ōsus |
| 3 | Latin | ont-to-s | — |
| 4 | Latin | -o-wont-to-s | — |