Where does “portulanus” come from?

portulanus (Medieval Latin) comes from Latin Portus, from Proto-Italic portus, from Proto-Indo-European pértus, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “portulanus”, step by step

StepLanguageWordMeaning
1LatinPortus” or, later, “Portus Rōmae”}} Portus large artificial harbour of Ancient Rome
2Proto-Italicportusharbour
3Proto-Indo-Europeanpértuscrossing
4Proto-Indo-Europeanper-before, in front; first; to go through
5Proto-Indo-Europeanpr̥tóspassed , crossed

Words derived from “portulanus”

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pértus →