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Fagus orientalis, the Oriental beech, a deciduous tree species found from northwest Turkey east to the Caucasus and Alborz Mountains
Rhynchelmis orientalis, a freshwater worm species found on Hokkaidō, Japan
In ssuk injeolmi (쑥인절미) and surichwi injeolmi (수리취인절미) are ssuk (Artemisia princeps var. orientalis) and surichwi (Synurus deltoides (AIT.) NAKAI) added.
Vibrio orientalis, a Gram-negative bacterium species in the genus Vibrio