震旦 Zhèndàn Cinasthana Origin Definitions Defs Strokes Stroke Words Sentences Sents 震旦纪 zhèndànjì Sinian Sinian (c. 800-542 million years ago), late phase of pre-Cambrian geological era震旦鸦雀 Zhèndànyāquè reed parrotbill reed parrotbill (Paradoxornis heudei), a bird species native to China