means The tiny openings in your skin through which sweat and oils escape, or, more broadly, any minute passage in a surface that lets liquids or gases pass through.

from From Latin 'porus,' borrowed from Greek 'poros,' meaning a passage, ford, or way through — the same root that gives us 'emporium' (a place reached by trading routes) and 'aporia' (literally 'no way through,' a state of being stuck). The Greeks imagined a 'poros' as a path across difficult ground; English narrowed it to the microscopic paths through skin and stone.