Where does “pus” come from?

pus (Old Catalan) comes from Latin post, from Latin poste, from Proto-Italic posti, from Proto-Indo-European pósti, from Proto-Indo-European pós — afterwards, post; by, at.

Ancestry of “pus”, step by step

StepLanguageWordMeaning
1Latinpostbehind; after, since, besides, except; behind,...
2Latinposteablative singular of postis
3Proto-Italicpostibehind, after
4Proto-Indo-Europeanpóstiafter
5Proto-Indo-Europeanpósafterwards, post; by, at

Words derived from “pus

Every word from Proto-Indo-European pósEvery word from Proto-Indo-European póstiEvery word from Proto-Italic posti