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二叠系
èr​dié​xì

Permian System

Definitions Defs Origin Strokes Stroke Words Sentences Sents
  1. 二 èr numeral
    two
    the number two; 2
  2. 叠 疊 dié verb
    to pile up
    To pile up or stack; to accumulate layer by layer
  3. 系 xì
    system (geology)
    (geology) a chronostratigraphic unit of rocks formed during a period of geological time, ranking below an erathem and above a series