Where does “dreinement” come from?

dreinement (Norman) comes from Norman drein, from Old French drain, from Old French derrain, from Vulgar Latin deretranus, from Latin dē, from Latin post, from Latin poste, from Proto-Italic posti — afterwards, post; by, at.

Definitions

Ancestry of “dreinement”, step by step

StepLanguageWordMeaning
1Normandreinlast
2Old Frenchdrain—
3Old Frenchderrainfinal, last; last
4Vulgar Latinderetranusto hinder
5Latindēof; concerning; about
6Latinpostbehind; after, since, besides, except; behind,...
7Latinposteablative singular of postis
8Proto-Italicpostibehind, after
9Proto-Indo-Europeanpóstiafter
10Proto-Indo-Europeanpósafterwards, post; by, at
Every word from Proto-Indo-European pós →Every word from Proto-Indo-European pósti →Every word from Proto-Italic posti →