子午线 zǐwǔxiàn meridian Origin Definitions Defs Strokes Stroke Words Sentences Sents 本初子午线 běnchūzǐwǔxiàn prime meridian the meridian of zero degrees longitude, used as the origin for measuring longitude and as the basis of standard time格林尼治本初子午线 Gélínnízhìběnchūzǐwǔxiàn Greenwich meridian the Greenwich meridian