Oak has been used as a Quinine substitute in the treatment of fevers. Tannins provide many of the healing properties of oak. Tannins bind with proteins in tissues, making a barrier resistant to bacterial invasion. Tannins strengthen tissues and blood vessels.
The opposite term Occident derives from the Latin word occidens, meaning west (lit. setting < occido fall/set). This term meant the west (where the sun sets) but has fallen into disuse in English, in favor of Western world.
Occidental are those from the West who do not have 'oriental eyes' ~ to put it at its simplest. It has to do with a missing or an additional, eyelid (something never fully explained to me). Sash. Apparently, I stand corrected. It has nothing to do with 'eyes' at all. I was mislead. I'll go beat my little bruvver up.