MDBG Mobile Chinese English Dictionary (iPhone, Android, Windows Phone)

Referenced entries:

郑	Zhèng	Zheng, a Zhou-dynasty state in the vicinity of present-day Xinzheng 新郑, a county-level city in Henan / abbr. for Zhengzhou 郑州, the capital of Henan / surname Zheng
郑	zhèng	used in 郑重