Where does “-s” come from?

-s (Middle French) comes from Old French -s, from Latin -is, from Latin -a, from Proto-Italic -ā, from Proto-Indo-European -éh₂.

Ancestry of “-s”, step by step

StepLanguageWordMeaning
1Old French-sindicates a nominative singular of a masculine...
2Latin-issuffixed to the root of nouns in composition,...
3Latin-asuffixed to the roots of verbs, forms agent...
4Proto-Italic-āForms masculine agent nouns from prefixed or compounded bases
5Proto-Indo-European-éh₂—

Words derived from “-s”

Every word from Proto-Indo-European -éh₂ →Every word from Latin -is →Every word from Latin -a →