noun
Etymology: part translation of Chinese (Pekingese) yu 2 -t'ung 2 tung tree oil, from yu 2 oil + t'ung 2 tung tree
1. : a pale yellow pungent drying oil obtained chiefly from the seeds of the tung tree and composed of glycerides especially of eleostearic acid and other unsaturated acids, that polymerizes to a hard gel on long standing or on heating, and that is used chiefly in quick-drying varnishes and paints and as a waterproofing agent — called also China wood oil, wood oil
2. : japanese tung oil