A variant spelling of dzeren; a Central Asian animal, either a type of gazelle or a hybrid livestock animal.
Another transliteration variant from Mongolian/Tibetan languages. Multiple spelling variations exist in English scientific and travel literature.
Naturalists in the 1800s wrote down the names of Mongolian animals phonetically, and since they didn't share a standard alphabet or language, you get ten different English spellings for the same creature! This is why scientists eventually use Latin names instead.
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